UK to EU Baby Clothes Size Converter
UK baby clothes are labelled by age while EU sizes go by height in centimetres — this converter lines the two systems up side by side.
Shopping international brands gets confusing fast, because a UK to EU baby clothes size converter has to bridge two completely different labelling systems. British clothes are tagged by age — Newborn, 0-3M, 3-6M and so on — while European clothes are tagged by the child's height in centimetres, like 56, 62, or 68. This guide lines the two up so you can shop a European brand with confidence or read an imported label without scratching your head. If you mostly shop Australian labels, the 0000 / 000 / 00 / 0 system maps onto the UK age column, so the same chart works for you too.
If you would rather skip the chart and get a size from your baby's actual measurements, the calculator handles it for you.
Open the baby clothing size calculator
UK to EU baby size conversion chart
The table below maps common UK age-based sizes to their closest EU centimetre sizes, along with the approximate age, height, and weight each one targets. The Australian numbered size is included so you can cross-reference local labels. Use it as a starting point, then fine-tune with your baby's real measurements.
| UK size | AU size | EU size | Approx. age | Height (cm) | Weight |
|---|---|---|---|---|---|
| Newborn | 0000 | 56 | 0–1 month | up to 56 | up to ~3.6 kg (8 lb) |
| 0–3M | 000 | 62 | 1–3 months | 56–62 | ~3.6–5.5 kg (8–12 lb) |
| 3–6M | 00 | 68 | 3–6 months | 62–68 | ~5.5–7.5 kg (12–17 lb) |
| 6–9M | 0 | 74 | 6–9 months | 68–74 | ~7.5–9 kg (17–20 lb) |
| 9–12M | 0 | 80 | 9–12 months | 74–80 | ~9–11 kg (20–24 lb) |
| 12–18M | 1 | 86 | 12–18 months | 80–86 | ~11–12 kg (24–26 lb) |
| 18–24M | 1 | 92 | 18–24 months | 86–92 | ~12–13 kg (26–29 lb) |
| 2–3Y | 2 | 98 | ~2–3 years | 92–98 | ~13–14 kg (29–31 lb) |
Notice the EU number is essentially the top of the height range it covers: EU 62 fits a baby up to about 62 cm tall, EU 74 up to about 74 cm, and so on. Once you internalise that pattern, the European numbers stop looking like a secret code.
Why the UK labels by age and the EU by height
The two systems reflect different philosophies. UK sizing — and the Australian numbered system that mirrors it — leans on age as a friendly shorthand. Most parents know their baby is three months old, and the label gives a quick guess at fit. The downside is that babies of the same age can differ by several centimetres and a kilogram or more, so an age label is only ever an average.
EU sizing instead anchors the label to height in centimetres, the single measurement most closely tied to how clothes actually fit. A baby who is tall for their age simply buys a higher number; a petite baby buys a lower one. There is no need to translate age into a guess about size, because the size already is the measurement. That is why a tape measure is your best friend when shopping European brands.
How to measure your baby for the right size
- Height: lay your baby flat and measure from the top of the head to the heel. This number maps almost directly to the EU size.
- Weight: useful as a cross-check, especially for chunkier or leaner babies who fall between heights.
- Size up when between: if your baby is between two sizes, the larger one usually buys more wear time. Babies grow fast and rarely shrink.
Reading a European label
European garments sometimes print a range rather than a single number, such as 62/68, which means the piece is cut to fit a child roughly between those two heights. When you see a range, the lower number is where the fit begins and the upper number is where your baby will likely outgrow it. Some brands also add a small age hint in months alongside the centimetre figure, but the centimetre number is the one to trust. If a label shows only a height in centimetres with no age at all, you now have the chart above to translate it instantly into the UK or Australian size you are used to.
It is worth noting that the centimetre sizes are not random. Each step up the scale — 56, 62, 68, 74 — rises by about six centimetres, which is roughly how much a baby grows between the common fitting points in the first months. That steady spacing is why the European system feels so tidy once you see the logic behind it: the label grows with the child in even, predictable increments.
Tips for shopping across systems
Brands vary, even within the same country, so treat every chart as an approximation rather than a guarantee. A few practical habits help: always check the specific brand's size guide if one is provided; favour your baby's height and weight over the age on the label; and remember that babies move through the early sizes quickly, so buying a hair large is rarely a mistake. For seasonal clothing, consider what size your baby will be when the weather arrives, not just today. Remember that Australian seasons run opposite to the northern hemisphere, so an imported "winter" range may arrive in your summer — a warm jacket bought in the exact current size may not fit by the time the cold sets in, so sizing up for outerwear in particular tends to pay off.
Finally, keep in mind that fit varies by garment type as much as by brand. A stretchy onesie has far more give than a structured pair of jeans, so the same baby might comfortably wear one EU size in soft basics and need the next size up in fitted pieces. When you are unsure, the soft, forgiving items are the safest to buy ahead, while structured clothing is better bought close to the time your baby will actually wear it.
Get a precise size from measurements
Charts get you close, but your baby's own height and weight get you closest. Enter those measurements and let the calculator suggest the best UK and EU size for the fit you want.
Frequently asked questions
- How do UK baby sizes convert to EU sizes?
- UK sizes are labelled by age (Newborn, 0-3M, 3-6M and so on) while EU sizes use height in centimetres (56, 62, 68…). As a rough guide, UK Newborn ≈ EU 56, 0-3M ≈ 62, 3-6M ≈ 68, and 6-9M ≈ 74. See the full chart above, or use our baby clothing size calculator.
- How do Australian 0000 / 000 / 00 / 0 sizes fit in?
- Australian brands often use a numbered system: 0000 ≈ newborn, 000 ≈ 0–3M, 00 ≈ 3–6M, and 0 ≈ 6–12M, then 1 for around 12–18 months. It tracks age closely, so it maps onto the UK column in the chart above and the converter shows the matching US, EU, Japan, and Korea sizes.
- Why does Europe size baby clothes by height in cm?
- European sizing ties the label to the child's actual height in centimetres, which is a more direct fit measurement than age. A baby who is tall for their age simply moves up a number, no guesswork needed.
- Should I buy by my baby's age or height?
- Height and weight beat age every time. Babies of the same age vary a lot, so measuring your baby and matching the EU centimetre size — or sizing up in UK labels — usually gives a better fit.
- What EU size is a UK 2-3 years?
- A UK 2-3 years toddler size lines up with roughly EU 92 to 98, which corresponds to about 92–98 cm in height and an age near 2 to 3 years. As always, check your baby's actual measurements.