Newborn Baby Clothes Size Chart: 0–12 Months by Age Weight

Newborn Baby Clothes Size Chart: 0–12 Months by Age Weight

By JusCubs Team · Updated May 2026 · Size Guide | Newborn Wear | Delhi NCR

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⚡ Quick Answer

The newborn clothing size chart by age: NB (Newborn) fits 0–1 month (up to 3.6 kg, 50–54 cm). 0–3M fits 1–3 months (3.6–6 kg, 54–61 cm). 3–6M fits 3–6 months (6–7.5 kg, 61–67 cm). 6–9M fits 6–9 months (7.5–9 kg, 67–72 cm). 9–12M fits 9–12 months (9–10.5 kg, 72–77 cm). At JusCubs, shop Newborn Boys (0–6M) and Newborn Girls (0–6M) — all in soft, breathable cotton starting from ₹349.

Why Most Parents Get Newborn Sizing Wrong

The single most common newborn clothing mistake is buying too many NB (Newborn) size items and too few 0–3M and 3–6M items. Most newborns outgrow the NB label within 2–4 weeks. Some larger babies — born above 3.5 kg — never fit NB at all.

The second most common mistake is shopping by age alone. Weight and height are far more reliable guides than age when it comes to infant clothes sizes. A 3-month-old weighing 5 kg and a 3-month-old weighing 7 kg will need completely different sizes, even though they are the same age.

This complete newborn clothing size chart gives you age, weight, and height for every size from NB through 9–12M — mapped to JusCubs' labels — so you buy exactly what fits.

📌 Before you read on: If you need to know how many items to buy in each size, read our companion guide: Newborn Baby Clothing Checklist: How Many Clothes Does a Newborn Need?

The Complete Newborn Clothing Size Chart (0–12 Months)

This is the master newborn clothes size chart covering every infant size from birth to 12 months. All measurements are in centimetres and inches, with weight in kilograms.

JusCubs Size Age Range Weight (kg) Weight (lbs) Height (cm) Height (in) Chest (cm) Waist (cm)
NB (Newborn) 0–1 month Up to 3.6 kg Up to 8 lbs 50–54 cm 19.5–21 in 36–38 cm 36–38 cm
0–3M 1–3 months 3.6–6 kg 8–13 lbs 54–61 cm 21–24 in 38–41 cm 38–40 cm
3–6M 3–6 months 6–7.5 kg 13–16.5 lbs 61–67 cm 24–26.5 in 41–44 cm 40–42 cm
6–9M 6–9 months 7.5–9 kg 16.5–20 lbs 67–72 cm 26.5–28.5 in 44–46 cm 42–44 cm
9–12M 9–12 months 9–10.5 kg 20–23 lbs 72–77 cm 28.5–30.5 in 46–48 cm 44–46 cm

💡 Always go by weight first, then height. Age is the least reliable indicator for infant clothes sizes. Two babies the same age can differ by 2–3 kg — an entire size difference.

Size NB (Newborn): 0–1 Month

Age: 0 to 1 month Weight: Up to 3.6 kg (up to 8 lbs) Height: 50–54 cm (19.5–21 inches)

The NB (Newborn) label is the smallest standard size in the newborn clothes sizing system. It is designed specifically for the first few weeks after birth, before rapid growth begins.

Key facts about NB size:

NB garments are cut very short in the body and narrow in the shoulders — proportioned for a baby that still spends most of its time curled in a foetal position. Most items feature envelope necklines or snap closures at the bottom for easy nappy changes.

Who fits NB: Babies born at or below average birth weight (2.5–3.5 kg in India). Babies born above 3.5 kg may skip NB entirely and go straight to 0–3M.

Who skips NB entirely: Larger newborns (above 3.5 kg at birth) and premature babies who are catching up fast. If your baby is born above 3.5 kg, buy primarily 0–3M and skip most NB items.

⚠️ Do not overbuy NB. Most newborns are in this size for 2–4 weeks maximum. 4–6 bodysuits, 2–3 Jhablas, and 2 clothing sets in NB is plenty for most babies.

Shop NB size at JusCubs:

Size 0–3M: 1–3 Months

Age: 1 to 3 months Weight: 3.6–6 kg (8–13 lbs) Height: 54–61 cm (21–24 inches)

The 0–3M size is the most important size to stock well. Most babies spend the longest time in this range — it covers the critical growth period from the first month through the end of the third month, when babies gain weight fastest (approximately 150–200 grams per week).

Key facts about 0–3M size:

At this stage, babies are spending more time awake and active. Garments need to allow full leg movement for kicking, and necklines should remain easy to pull over the head without pressing on the soft spot. Snap-crotch bodysuits and front-open Jhablas are the most practical choice.

Indian climate note: For babies born into Delhi, Noida, Gurugram, or any North Indian city in summer (March–June), 0–3M should be primarily lightweight cotton — single-layer T-shirts and Jhablas over a simple nappy. In winter (November–February), add a light sweatshirt or sleepsuit over the base layer.

💡 Stock 0–3M most heavily of all sizes. Most babies spend 6–8 weeks here. 8–10 bodysuits or Jhablas, 3–4 clothing sets, and 2–3 pairs of shorts or pants in 0–3M is the right quantity.

Shop 0–3M size at JusCubs:

Size 3–6M: 3–6 Months

Age: 3 to 6 months Weight: 6–7.5 kg (13–16.5 lbs) Height: 61–67 cm (24–26.5 inches)

By 3 months, most babies have completed their most intense growth phase and begin growing more steadily. The 3–6M size fits the longest overall — many babies wear it for 8–10 weeks. It also coincides with the most active phase yet: babies are rolling, reaching, kicking constantly.

Key facts about 3–6M size:

Garments need to allow full limb movement. Rompers with snap closures at the crotch are ideal at this stage — they prevent the top from riding up during play and make nappy changes fast. Clothing sets (T-shirt + shorts or pants) become practical because babies are now being held upright and seen by visitors regularly.

This size also marks the beginning of season-aware dressing. A baby born in October in Delhi will hit the 3–6M window in January — the coldest month. A baby born in March will hit 3–6M in June — the hottest. Adjust your wardrobe accordingly.

💡 Buy 3–6M in the same quantity as 0–3M. Despite babies spending less time here per calendar month, growth is faster in this window and you will go through clothes quickly due to more active play and more frequent spit-up.

Shop 3–6M size at JusCubs:

Size 6–9M: 6–9 Months

Age: 6 to 9 months Weight: 7.5–9 kg (16.5–20 lbs) Height: 67–72 cm (26.5–28.5 inches)

At 6 months, babies enter the most exciting developmental phase of their first year — sitting up, beginning solids, and starting to crawl. Infant clothes sizes for this stage need to accommodate legs that are now constantly moving and arms that are reaching and grabbing.

Key facts about 6–9M size:

Two-piece sets (separate top and bottom) become increasingly practical now. Elastic waist pants, joggers, and shorts are easier to manage for quick nappy changes. For girls, frocks and dresses need to be long enough to cover the nappy when sitting but not so long they restrict crawling.

6–9M is also the weaning wardrobe. At around 6 months, most babies begin solids. This means significantly more food staining. Stock easily washable, dark or patterned garments in this size — light colours will show every purée mark.

⚠️ Season alert for Delhi NCR parents: Babies hitting the 6–9M window in October–November will need a warm layer for North India's winter. JusCubs' Infant Boys Sweatshirts, Jackets & Hoodies start from the 6–9M size onward.

What to stock in 6–9M:

At this stage, the Newborn (0–6M) range transitions into the Infant Boys (6M–4Y) and Infant Girls (6M–4Y)collections at JusCubs. This opens up a much wider range of clothing types.

Shop 6–9M size at JusCubs:

For Boys (6–9M from Infant Boys 6M–4Y range):

For Girls (6–9M from Infant Girls 6M–4Y range):

Size 9–12M: 9–12 Months

Age: 9 to 12 months Weight: 9–10.5 kg (20–23 lbs) Height: 72–77 cm (28.5–30.5 inches)

By 9 months, most babies are crawling confidently and many are beginning to pull themselves up to stand. The 9–12M infant size needs to work across all these positions — lying, sitting, crawling, standing, and cruising. Garments with an elastic waist and comfortable crotch that doesn't restrict leg movement are non-negotiable.

Key facts about 9–12M size:

Knees now take a beating. Soft-kneed cotton pants and leggings in this size wear out faster than upper body garments because of constant crawling contact with the floor. Stock more bottoms than tops in this size.

First steps typically happen between 9 and 13 months. If your baby is walking or close to walking, fitted ankles on pants become important — loose hems catch under feet and can cause trips.

💡 9–12M is the last size before transitioning to the full Infant (6M–4Y) toddler range. After 12 months, shop the Infant Boys (6M–4Y) and Infant Girls (6M–4Y) collections in 12–18M and 18–24M sizes, which are part of the same range.

Shop 9–12M size at JusCubs:

For Boys (9–12M):

For Girls (9–12M):

Newborn Clothes Sizing: What the Labels Actually Mean

Indian infant clothing labels use age-range sizing (e.g., 0–3M, 3–6M). International brands often use weight-based sizing (e.g., "up to 6 kg", "6–9 kg"). Here is how both systems map to each other and to JusCubs' labels:

JusCubs Label Indian Age Label International Weight Label US/UK Size Label
NB Newborn Up to 3.6 kg NB / 0M
0–3M 0–3 Months 3.6–6 kg 0–3M
3–6M 3–6 Months 6–7.5 kg 3–6M
6–9M 6–9 Months 7.5–9 kg 6–9M
9–12M 9–12 Months 9–10.5 kg 9–12M
12–18M 12–18 Months 10.5–12 kg 12–18M
18–24M 18–24 Months 12–13.5 kg 18–24M

📌 Important: Indian babies, on average, tend to be slightly smaller than WHO growth reference charts suggest. If your baby is on the lower end of the weight range for a given size, go with the smaller size — especially for bodysuits and rompers, where a loose crotch causes discomfort.

Newborn Clothes Sizing: Boys vs Girls — Is There a Difference?

In terms of infant clothes sizes and actual measurements, newborn boys and girls are sized identically in the 0–12 month range. The same NB, 0–3M, 3–6M, 6–9M, and 9–12M measurements apply to both.

The difference is purely in garment cut and style:

Newborn Boys: Garments tend to have a straight-leg cut. Rompers are cut slightly wider in the shoulder. Styles include Jhablas, T-shirts, shorts sets, and dungarees.

Newborn Girls: Garments may include a slightly more flared or A-line cut at the hem. Frocks, bloomers, and bow-detail rompers are standard in the girls' range.

Practically, this means:

  • You can use an older sibling's unisex bodysuits and sleepsuits regardless of gender
  • Size is determined by the same measurements — use the chart above for both boys and girls
  • Shop Newborn Boys (0–6M) and Newborn Girls (0–6M) for gender-specific styles, or choose unisex pieces from either collection

How to Measure Your Newborn for the Right Clothes Size

Age and weight charts are useful guides, but the most accurate way to size your baby's clothing is to take three measurements. Here is the correct method:

Step 1 — Length (Height): Lay your baby flat on their back. Gently straighten the legs and measure from the crown of the head to the heel. This is the body length measurement used in the chart above.

Step 2 — Chest: Wrap a soft tape measure around the fullest part of the chest — across the nipple line. Keep the tape horizontal and snug but not tight. Do not pull the tape taught.

Step 3 — Weight: Use your baby's most recent weigh-in at the paediatrician or hospital. Weight is the single most reliable sizing indicator for newborn clothing in the 0–3M window.

Step 4 — Match to size chart: Compare all three measurements to the table above. If your baby sits between two sizes, always size up — especially for bodysuits and sleepsuits where a too-tight snap crotch is uncomfortable.

🌡️ Indian climate tip for Delhi NCR parents: In North Indian summers (April–September), size up one size when buying cotton bodysuits. The extra room improves airflow around the body and reduces heat rash — a very common issue for babies in Delhi, Noida, Gurugram, and Ghaziabad during peak summer months.

Infant Size Guide: How Many Clothes Per Size to Buy

This is the most practical question parents ask. Here is the recommended quantity per size, based on daily laundry frequency in Indian households:

Size Bodysuits / Jhablas Clothing Sets Bottoms (Shorts/Pants) Accessories (Nappy/Mittens/Booties)
NB 4–6 1–2 1–2 1 set
0–3M 8–10 3–4 3–4 1–2 sets
3–6M 6–8 3–4 3–4 1 set
6–9M 5–6 3–4 4–5 —
9–12M 4–5 3–4 5–6 —

📌 Note: These quantities assume washing every 2–3 days. If you wash daily, reduce each quantity by 2–3 items. If you are planning to buy ahead for seasons (common in India due to summer–winter swing), add 2–3 extra sets in each size.

Also read: Newborn Baby Clothing Checklist: How Many Clothes Does a Newborn Need?

Newborn Clothes Sizing for Indian Weather: Season-by-Season Guide

India's extreme climate variation — 45°C Delhi summers, 5°C Delhi winters, year-round humidity in coastal cities — means newborn clothes sizing cannot be separated from seasonal planning. Here is how to approach it by birth season:

Born October–February (Winter Baby, Delhi NCR)

Your newborn will spend the NB and 0–3M windows in North India's coldest months. Priority garments: full-sleeve Jhablas, cotton sleepsuits with snap feet, and a light sweatshirt layer for 0–3M and above. By the time your baby reaches 3–6M (January–April), it will be transitioning to spring — buy a mix of half-sleeve and full-sleeve sets in this size.

Born March–June (Summer Baby, Delhi NCR)

Your newborn enters the NB window in India's hottest season. Priority garments: lightweight half-sleeve Jhablas, single-layer cotton bodysuits, and breathable rompers. Avoid synthetic fabrics entirely. By the time your baby reaches 3–6M (June–September), monsoon season begins — add quick-dry cotton pieces that handle humidity. Stock Infant Boys Shorts & Threefourth and Infant Girls Frocks & Dresses in the 6–9M size for the transition into September.

Born July–September (Monsoon Baby, Delhi NCR)

High humidity is the primary concern. Quick-drying cotton, frequent changes (babies sweat significantly in monsoon heat), and breathable fabrics are essential. By the time your baby hits 3–6M (October–December), winter begins — have a small stock of warm layers ready in the 3–6M size.

💡 JusCubs tip: JusCubs' organic cotton range is especially well-suited to Indian climate extremes. Organic cotton regulates temperature more effectively than standard processed cotton, making it ideal for babies who move between air-conditioned rooms and outdoor heat — common in Delhi, Noida, and Gurugram households. Browse the Organic Cotton Premium collection.

Newborn Clothes Size Chart: Common Mistakes to Avoid

Mistake 1: Buying too many NB size items Most babies outgrow NB in 2–4 weeks. Buy no more than 4–6 NB items total. Redirect your budget to 0–3M and 3–6M.

Mistake 2: Sizing by age rather than weight A 2-month-old weighing 4.5 kg needs 0–3M. A 2-month-old weighing 6.5 kg needs 3–6M. Always check the weight column in the chart above.

Mistake 3: Ignoring the Indian season when buying ahead Buying winter clothes in a summer size, or vice versa, is a common trap. Your baby's size and the current season will not always align the way you expect. Plan 4–6 weeks ahead, not 3–4 months ahead.

Mistake 4: Not leaving room for nappy bulk Nappies add 1–2 cm of bulk around the waist and seat. Garments that look like they just fit on a bare baby will be tight with a nappy. This is why elastic waistbands are non-negotiable for the 0–12M range.

Mistake 5: Washing new clothes without pre-washing first All new clothes — regardless of brand — carry manufacturing residues, dyes, and sizing chemicals that can irritate newborn skin. Always pre-wash before the first wear. Read our complete guide: How to Wash Newborn Clothes for the First Time.

Buy Newborn Baby Clothes Online — Delhi NCR & Across India

Parents across Delhi NCR searching for newborn clothes online in Delhi, infant baby clothes Noida, or newborn clothing size chart India can shop the complete JusCubs newborn range with fast pan-India delivery.

JusCubs Newborn Boys (0–6M) — full category links:

JusCubs Newborn Girls (0–6M) — full category links:

JusCubs delivers to: New Delhi · South Delhi · North Delhi · East Delhi · West Delhi · Noida · Greater Noida · Noida Extension · Gurugram · Ghaziabad · Faridabad · Meerut · Sonipat · Bahadurgarh · Rohtak · Panipat · Agra · Mathura · Jaipur · Chandigarh · and 19,000+ pin codes across India.

Find a JusCubs store near you → | Learn about JusCubs →

Frequently Asked Questions

Q: What is the newborn clothing size chart by age and weight? The standard newborn clothes size chart: NB = 0–1 month, up to 3.6 kg, 50–54 cm. 0–3M = 1–3 months, 3.6–6 kg, 54–61 cm. 3–6M = 3–6 months, 6–7.5 kg, 61–67 cm. 6–9M = 6–9 months, 7.5–9 kg, 67–72 cm. 9–12M = 9–12 months, 9–10.5 kg, 72–77 cm. At JusCubs, these correspond to the NB, 0–3M, 3–6M, 6–9M, and 9–12M labels in our Newborn Boys and Newborn Girls collections.

Q: What newborn clothes size should I buy for a baby shower gift? Buy 0–3M or 3–6M. Never buy NB as a gift — the baby may already be past NB by the time the gift is used. 0–3M is the safest universal choice. 3–6M is ideal for a gift because it gives the parents something to look forward to using in a few weeks.

Q: How long do babies wear newborn (NB) size? Most babies wear NB size for 2–4 weeks only. Babies born at or above 3.5 kg may skip NB entirely and go straight to 0–3M. Do not overbuy NB — 4–6 items maximum is sufficient.

Q: What is 0–3M in Indian baby clothing sizes? In Indian baby clothes, 0–3M is labelled exactly as "0–3M" or "0–3 Months." It covers babies from 1–3 months of age, weighing 3.6–6 kg and measuring 54–61 cm. At JusCubs, 0–3M is available across all Newborn Boys and Newborn Girls collections including Jhablas, Rompers, Clothing Sets, and Accessories.

Q: What size do I buy for a baby born in India — is it different from US sizing? Indian baby clothing uses age-based labels (0–3M, 3–6M) identical to international sizing in structure. The key difference is that Indian babies, on average, may be slightly lighter than WHO charts suggest, meaning some Indian babies may fit a smaller size than their age implies. Always use the weight column in the chart above as your primary guide.

Q: When does a baby move from newborn to 0–3M clothes? When your baby reaches approximately 3.5–4 kg in weight and 54 cm in length, NB garments will begin to feel snug — particularly in the length of the bodysuit and around the snap crotch. This typically happens at 2–4 weeks of age. Move to 0–3M at this point.

Q: When does a baby move from 0–3M to 3–6M clothes? When your baby reaches approximately 6 kg in weight and 61 cm in length, 0–3M garments will begin to feel tight across the chest and short in the body. This typically happens between 10–14 weeks of age. Move to 3–6M at this point. Signs it is time to size up: snap buttons pulling, legs being cramped in rompers, and the neckline riding up.

Q: Where can I find newborn baby clothes online in Delhi, Noida, or Gurugram? JusCubs delivers the complete Newborn Boys (0–6M) and Newborn Girls (0–6M) range to all Delhi NCR locations — Delhi, Noida, Greater Noida, Gurugram, Ghaziabad, Faridabad, and beyond — with pan-India delivery. Shop at juscubs.com or find a store near you.

Q: Does JusCubs have organic cotton options in newborn sizes? Yes. JusCubs' Organic Cotton Premium collectionincludes garments suitable for newborns and infants. Organic cotton is especially recommended for babies with sensitive skin or those born in high-pollution urban environments like Delhi NCR.

Related Guides

Shop the full range: Newborn Boys (0–6M) · Newborn Girls (0–6M) · Infant Boys (6M–4Y) · Infant Girls (6M–4Y) · Organic Cotton Premium · Value Packs · Store Locator · Blog

0–12 Months Dresses for Babies Infant Clothes Infant Clothing Kids T-Shirt Size Chart Newborn Baby Clothes Newborn Baby Clothes Size Chart Newborn Baby Clothing

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