Baby clothing sizes by age: the quick guide that stops you buying wrong
How baby clothing sizes map to age, why they vary between brands, and how to get it right when buying or swapping.
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Guide
It is easy to overbuy before a baby arrives. Excitement, gifts and endless internet lists push you to fill the wardrobe with garments that often never get worn. A newborn grows fast and needs less than it seems, especially in the first weeks.
The newborn size lasts a very short time, sometimes only a few weeks, and some babies arrive ready for the next one. So it does not pay to buy much of this stage. Better to have a few garments, wash them often and only top up if needed.
Most families end up using a fraction of what they prepared. Starting small and adding once you see what your baby is like works out better than filling drawers in advance.
For the first weeks, six to eight bodysuits, four or five pyjamas or sleepsuits, a couple of light cardigans and a few pairs of socks usually cover it. Depending on the season, add a hat, mittens and something warmer. That handles daily life without the fuss.
Favour garments that are easy to put on and take off, with wide openings and simple fastenings. At this stage you will change clothes several times a day, so practicality matters far more than the design.
Newborn clothing is among the best to buy second-hand, precisely because it is worn for so little time. Many garments arrive almost unused, and at that price the gap with buying new is huge.
Bodysuits, pyjamas and basics are ideal to get handed down or swapped. Keep the budget for the few things you genuinely want to buy new and solve the rest by reusing.
If you are given larger sizes, do not mix them with what you use now. Separate them by size and store them labelled, so you find them when they fit instead of discovering them once they no longer do.
And when the newborn size gets too small, move it quickly. In good condition it is in high demand from families coming right behind you, so passing it on or swapping it closes the loop before it sits idle in a drawer.
Colmena in Barcelona
Colmena is a local exchange for families in Barcelona. Bundles by category and age range, reviewed before going live, with pickup near home.
Keep reading
How baby clothing sizes map to age, why they vary between brands, and how to get it right when buying or swapping.
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The real options for finding second-hand baby clothes in Barcelona, with nearby pickup and no shipping, depending on what you need to solve.
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Why searching for second-hand children's clothes usually ends up being more complicated than it should, and how to solve it with less effort.
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