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Which size baby clothes do you buy when? Guide and Size Chart by Age
As a (future) parent, you quickly realize: babies grow incredibly fast. One day a onesie fits perfectly, the next day it's already tight. But whichsizebaby clothing buy now best, and how do you know if you are right?
In this blog, we give you a handy size chart by age , practical buying tips and we tell you what to watch out for when shopping for your little one.
Why size labels can be confusing
Baby sizes are often indicated by age (e.g., 56 = 1 month), but every baby is different. Some babies weigh 4 kg and are 55 cm long at birth, while others remain smaller well past their first birthday. Additionally, clothing sizes can vary between brands.
Therefore, it is wise not to base yourself solely on age, but especially on length and body buildof your child.
Baby clothing size chart by age
| Age of baby | Average length | Baby clothing size |
|---|---|---|
| Premature (0-1 kg) | < 44 cm | 38 – 44 |
| Newborn (0-1 month) | 45 – 50 cm | 50 |
| 0 – 2 months | 50 – 56 cm | 56 |
| 2 – 4 months | 57 – 62 cm | 62 |
| 4 – 6 months | 63 – 68 cm | 68 |
| 6 – 9 months | 69 – 74 cm | 74 |
| 9 – 12 months | 75 – 80 cm | 80 |
| 12 – 18 months | 81 – 86 cm | 86 |
| 18 – 24 months | 87 – 92 cm | 92 |
some brands use double sizes such as 50/56 or 62/68 – handy if you want some room to grow.
Tips for buying baby clothes
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Do not buy too many in size 50: Many babies outgrow this quickly, especially if they are larger at birth.
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Choose clothing by length, not by age:Length is more reliable, especially with faster growers.
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Go for comfort: Soft fabrics, stretchy materials, and easy fastenings make dressing much easier. The brand that excels in this is Petit Bateau.The baby and children's pajamas and clothing from Petit Bateau are super durable and last for generations.
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Take the season into account: Buy in advance for the following sizes, but consider which season it will be (e.g., summer size 74 vs. winter size 74).
👉 If you are unsure between two sizes: choose the larger size Babies grow quickly in them and they are more comfortable to wear.