Size Guide

Every child is unique, so our age sizing is intended as a guide only. For the best fit, we recommend comparing the garment measurements in our size chart with a swimsuit that already fits your child well.

Girls Swimwear

One pieces, bikinis and swim sets. Sizes 1 to 16. All measurements are taken from the garment laid flat and unstretched, in centimetres. The easiest way to choose is to measure a swimsuit that already fits your child well and compare it with the chart.

Size Age ALength BHip CBust DWaist
1 12–18 m 40 22 23 23
2 1–2 y 42 23 24 24
3 2–3 y 47 24 25 25
4 3–4 y 49 25 26 25.5
5 4–5 y 52 26 27 26
6 5–6 y 54 28 29 27
8 7–8 y 58 30 31 29
10 9–10 y 60 32 33 31
12 11–12 y 64 34 36 33
14 13–14 y 66 36 38 34
16 15–16 y 68 38 40 35

Measurements in cm, garment laid flat. Length (A) applies to one pieces; for two-piece styles use bust, waist and hip.

Olga Valentine girl showing where to measure length, hip, bust and waist
  • ALength: top of the shoulder strap down to the crotch
  • BHip: straight across the widest point
  • CBust: straight across, just under the arms
  • DWaist: across the narrowest point

Measure what fits

Lay a swimsuit your child wears now on a flat surface and measure it unstretched. It's more reliable than measuring a wriggling child.

Allow for stretch

Our swim fabric has four-way stretch and gives around 2–4 cm when worn, so a snug flat measurement is fine.

Between sizes?

Styles can vary by 1–2 cm. If you're unsure, size up for extra length and a longer season of wear.

Girls Boardshorts

Elastic waist with tie. Sizes 1 to 16.

Size Age AWaistband width
1 12–18 m 23
2 1–2 y 24
3 2–3 y 25
4 3–4 y 25.5
5 4–5 y 26
6 5–6 y 27
8 7–8 y 29
10 9–10 y 31
12 11–12 y 33
14 13–14 y 34
16 15–16 y 35

Measurements in cm, waistband laid flat and unstretched. The elastic gives a few extra centimetres of stretch.

Girls boardshorts laid flat, measured straight across the waistband
  • AStraight across the top of the waistband, edge to edge

Boys Boardshorts

Elastic waist with drawcord. Sizes 1 to 14.

Size Age AWaistband width
1 12–18 m 22
2 1–2 y 23
3 2–3 y 24
4 3–4 y 24.5
5 4–5 y 25
6 5–6 y 26
8 7–8 y 28
10 9–10 y 30
12 11–12 y 31
14 13–14 y 33

Measurements in cm, waistband laid flat and unstretched. The elastic gives a few extra centimetres of stretch.

Boardshorts laid flat, measured straight across the waistband
  • AStraight across the top of the waistband, edge to edge

Hats & Caps

Head circumference, measured around the head.

Baby hats Age Headcm
XS 3–6 months 42
S 6–12 months 47
M 12–24 months 50
L 2–3 years 52
Bucket hats & caps Age Headcm
XS 3–5 years 53
S 5–7 years 54
M 7–12 years 56
L 12+ years 58

If your child is between sizes, go up. Baby hats have an adjustable chin tie.

A
  • ASoft tape around the widest part of the head, just above the ears and across the forehead

Still not sure? Get in touch and we'll help you choose.