Sizing
Baby clothes size chart by age, height and weight
Which size to buy for a baby from 0 to 24 months: a size chart with height, weight, chest and waist, how to measure a baby, and when to size up.
The short answer
Choose by your baby’s length first, then their weight, and treat the age on the label as a starting point. In our sizes, 0–3M fits babies of about 56–62 cm and 4–6 kg, 3–6M fits 62–68 cm and 6–8 kg, 6–12M fits 68–80 cm and 8–10 kg, 12–18M fits 80–86 cm and 10–12 kg, and 18–24M fits 86–92 cm and 12–13.5 kg. Between sizes, choose the larger one.
How baby sizes work
Baby clothes are labelled by age in months: 0–3M, 3–6M, 6–12M, 12–18M and 18–24M. Babies grow at very different rates, though, so the age on the label is only a starting point. Your baby’s length (their height, measured lying down) is the most reliable guide, then their weight.
Our sizes follow standard international baby sizing. The chart below shows the body measurements each size is made for, not the measurements of the garment itself.
Baby size chart
Body measurements in centimetres and kilograms, with inches and pounds in brackets. Between sizes, choose the larger one.
| Size | Height cm (in) | Weight kg (lb) | Chest cm (in) | Waist cm (in) |
|---|---|---|---|---|
| 0–3M | 56–62 (22–24.4 in) | 4–6 (8.8–13.2 lb) | 40–42 (15.5–16.5 in) | 40–42 (15.5–16.5 in) |
| 3–6M | 62–68 (24.4–26.8 in) | 6–8 (13.2–17.6 lb) | 42–44 (16.5–17.5 in) | 42–44 (16.5–17.5 in) |
| 6–12M | 68–80 (26.8–31.5 in) | 8–10 (17.6–22 lb) | 44–47 (17.5–18.5 in) | 44–46 (17.5–18 in) |
| 12–18M | 80–86 (31.5–33.9 in) | 10–12 (22–26.5 lb) | 47–49 (18.5–19.5 in) | 46–48 (18–19 in) |
| 18–24M | 86–92 (33.9–36.2 in) | 12–13.5 (26.5–29.8 lb) | 49–51 (19.5–20 in) | 48–50 (19–19.5 in) |
These are your child’s body measurements, not the garment’s: each size is made to fit a child of that height and weight. Not sure between two sizes? Ask us on WhatsApp before you order.
How to measure a baby
- Length: lay your baby on their back on a firm, flat surface, gently straighten their legs, and measure from the top of the head to the heel. It is easier with two people.
- Weight: use the latest weight from your baby’s check-up or vaccination card.
- Chest: measure around the fullest part of the chest, under the arms, with the tape comfortably loose.
Signs it is time for the next size
- The snaps between the legs strain, or the suit pulls at the shoulders when your baby stretches.
- In a footed sleepsuit, their toes reach the end of the feet. Covered feet should leave room for the toes to move.
- Sleeves or legs finish well above the wrist or ankle.
- The neckline is a struggle to get over their head.
Buying ahead, or buying a gift
Babies outgrow the smallest sizes quickly, so for a newborn gift 3–6M is often the more useful choice, and it will fit for longer. For seasonal pieces, such as a winter jumpsuit, think about the size the baby will be when the weather turns, not the size they are today.
Quick answers
What size should I buy for a newborn?
Most newborns wear 0–3M, which is made for babies up to about 62 cm long and 6 kg. It will be a little roomy at first and then fit for the first weeks to months. A larger baby may be ready for 3–6M sooner.
Is 0–3 months the same as newborn size?
Not quite. Some brands also make a smaller “newborn” size for babies under about 56 cm. Our smallest size is 0–3M, which fits from about 56 cm.
Should I buy baby clothes a size bigger?
If your baby is near the top of a size, or you are buying for a few months ahead, yes. Babies grow fast in the first year, so the larger size gets more wear.
What size frock or outfit for a 6 month old baby?
For most 6-month-olds, 6–12M, which is made for babies about 68–80 cm long and 8–10 kg. A smaller 6-month-old, under about 68 cm and 8 kg, may still fit 3–6M. Go by length and weight rather than age.
What size does a 2 year old wear?
Our largest size is 18–24M, made for children about 86–92 cm tall and 12–13.5 kg, so it fits many children up to their second birthday. A taller two-year-old needs 2–3Y, which we don’t stock.
How long will my baby stay in each size?
Roughly the months on the label, but babies grow fastest in the first months, so many move from 0–3M to 3–6M sooner. Check height and weight against the chart every few weeks rather than waiting for a birthday.
What age is 12–18M?
12–18M is for babies aged about one to one and a half, and 18–24M for about one and a half to two. After that, sizes are given in years, starting with 2–3Y.