Sunnaroo Sizing & Fit Guide

Finding the perfect fit for your growing adventurer should be as easy as a day at the beach.☀️

Because every baby grows at their own pace, we recommend using our measurements below rather than relying on age alone. Our UPF 50+ gear is designed with a comfortable, "play-ready" fit in mind.

🌸 Girls Swimwear

Our girls' one-pieces blend adorable style with a secure, stretch-fit. Designed to stay comfortable from the first splash to the last sandcastle!

Size Chest Width Body Length Hip Width Sleeve Length
0-3 Months 20 cm 31 cm 21 cm 22 cm
3-6 Months 21.5 cm 33 cm 22.5 cm 24 cm
6-12 Months 23 cm 35.5 cm 24 cm 26.5 cm
12-18 Months 24 cm 38 cm 25.5 cm 29 cm
18-24 Months 25.5 cm 40.5 cm 26.5 cm 30.5 cm

👕 Boys Swim Tops

Our tops are designed with a stretch-fit to stay in place while splashing. If you prefer a looser look, we recommend sizing up.

Size Chest Width Body Length Sleeve Length
0-3 Months 22 cm 29 cm 22 cm
3-6 Months 23 cm 31 cm 24 cm
6-12 Months 24.5 cm 33 cm 26.5 cm
12-18 Months 26 cm 35 cm 29 cm
18-24 Months 26.8 cm 36 cm 30.5 cm

🩳 Boys Swim Bottoms

Designed with a comfortable waistband to stay secure. All measurements account for the extra room needed for a swim diaper.

Size Waistband Lower Hip Outside Leg
0-3 Months 20 cm 26 cm 13.5 cm
3-6 Months 21 cm 27 cm 15 cm
6-12 Months 22 cm 29 cm 18 cm
12-18 Months 22.5 cm 30 cm 19.5 cm
18-24 Months 23 cm 31 cm 21 cm

Frequently Asked Questions

"My baby is between sizes, what should I do?"

Always size up! Babies grow quickly, and a slightly larger fit ensures the fabric isn't overly stretched, which maintains the integrity of the UPF 50+ protection.

"Do these fit over swim diapers?"

Yes! Our swim trunks are specifically patterned with extra "bum room" to accommodate both disposable and reusable swim diapers comfortably.

"Will the fabric shrink?"

Our premium UPF fabrics are designed to hold their shape. However, to keep the sun-protection at its best, we recommend cold washing and hanging to dry.

Still Unsure?

We’re here to help! Send a quick note to our team with your baby's current weight and height, and we'll help you pick the perfect size.