Boys’ swim trunks sizing

Boys’ Size Guide

Comfortable, secure, and built for splashing. Our boys’ swim trunks are designed to match Dad’s — same print, scaled for the smallest swimmer in the family.

Boys’ Size Chart

Size	Age	Height cm	Height in	Weight kg	Weight lb
0/6 m	0–6 mo	60–67	23″–26″	5–8	11–18
6/12 m	6–12 mo	67–76	26″–30″	8–11	18–24
12/18 m	12–18 mo	76–82	30″–32″	10–12	22–26
2 / 2T	2 yr	85–92	33″–36″	12–14	26–31
4 / 4T	3–4 yr	95–104	37″–41″	14–17	31–37
5	4–5 yr	104–110	41″–43″	16–19	35–42
6	5–6 yr	110–118	43″–46″	18–22	40–48
8	7–8 yr	122–130	48″–51″	22–28	48–62
10	9–10 yr	134–142	53″–56″	28–35	62–77
12	11–12 yr	146–154	57″–61″	35–43	77–95
14	13–14 yr	156–164	61″–65″	43–52	95–115

How to Choose

Start with age, then check height and weight. Boys grow fast — if he is tall or strong for his age, size up so the trunks last through the season.

Elastic waistband with adjustable drawcord.
UPF 50+ sun protection on all boys’ trunks.
Soft stretch-mesh liner for comfort and security.
Two side pockets.
Designed to match Men’s trunks in the same print — perfect for Daddy & Me sets.

Shop Daddy & Me Sets →

Need a custom size? Email info@lainoswimwear.com.