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Baby Clothing Size Calculator
Not sure what size to buy? Enter your baby's age to see the likely clothing size, with a height and weight chart from newborn to two years. Brands vary, so use it as a starting point.
Likely clothing size
Baby clothing size chart by age, height and weight
Most baby clothing is labelled by age, but the height and weight ranges below are what those labels are really based on. If your baby sits between two sizes, go up, especially for sleepsuits and anything with feet.
| Size | Age (months) | Height | Weight |
|---|---|---|---|
| Newborn (NB) | 0 | up to 56 cm | 2.5 to 4 kg |
| 0 to 3 months | 0-3 | 56 to 62 cm | 4 to 6 kg |
| 3 to 6 months | 3-6 | 62 to 68 cm | 6 to 8 kg |
| 6 to 9 months | 6-9 | 68 to 74 cm | 8 to 9 kg |
| 9 to 12 months | 9-12 | 74 to 80 cm | 9 to 10.5 kg |
| 12 to 18 months | 12-18 | 80 to 86 cm | 10.5 to 12 kg |
| 18 to 24 months | 18-24 | 86 to 92 cm | 12 to 13.5 kg |
| 2T (2 years+) | 24+ | 92 to 98 cm | 13.5 to 15 kg |
Heights and weights follow common UK, EU and Australian size charts, where the size number is the tallest baby it fits (a size 68 fits up to 68 cm), checked against WHO growth medians on 11 Oct 2026. US and Japanese brands run differently, so check the brand's own chart.
Tips for buying baby clothes in Singapore
- In our warm climate, light cotton and short sleeves work for most of the year; a thin layer is enough for air-conditioned malls.
- Buy a size up for longevity, babies grow through newborn size quickly.
- Choose easy nappy-change designs (envelope necks, snaps along the legs).
Planning your baby's wardrobe? See our guides to swaddles and sleep sacks and newborn care basics.
Sources
- WHO Child Growth Standards: length/height-for-age and weight-for-age, read 11 Oct 2026
- David Jones baby size guide (Australian sizes 0000 to 2 with heights and weights), read 11 Oct 2026
- Mother&Baby UK: baby clothes sizes, read 11 Oct 2026
