Size guide Hello Hossy

Hello Hossy sizes by age, with the measurement that matters most for each item. If your child is between two sizes, choose the larger one. All measurements in cm unless stated otherwise.

Caps and bucket hats

Age	Head circumference
3-9 months	42-46
9-18 months	44-48
2-5 years	48-52
6+ years	52-56
Mums	54-56
Dads	56-58

Our size labels show the head circumference in cm. Measure around the head, 1 cm above the ears and eyebrows. The 42-46 size exists for bucket hats only.

Girls' swimsuits

Age	Child height	Garment height A	Garment width B
3-4 years	88-107	42	21
5-6 years	108-116	46	23
7-8 years	117-126	50	25

Choose by your child's height. A and B are measured on the swimsuit laid flat; the fabric stretches.

Boys' swim shorts

Age	Child height	Garment height A	Garment width B
3-4 years	88-107	21	24.5
5-6 years	108-116	22.5	26
7-8 years	117-126	24	27.5

Choose by your child's height. A (side length) and B (waist width) are measured on the shorts laid flat.

Rain jackets

Age	Child height	Chest A, laid flat
2-3 years	89-98	52-54
4-6 years	99-116	55-59
7-9 years	117-134	60-66

Hello Hossy publishes no measurements for the rain pants; they use the same age sizes.

Socks

Age	Shoe size (EU)
1-2 years	22-24
2-3 years	24-26
4-6 years	27-31
7-9 years	32-35

Your child's shoe size is the best guide.

Sunglasses

Size	Temple width (mm)	Age
113	113	9-24 months
116	116	2-3 years
119	119	3-5 years
122	122	5-8 years

The size is the width between the temples in mm. Size 113 comes with a baby strap. An optician can adjust the temples.

Download this size guide as PDF

Not sure which size to choose? Write to us at hello@tummytime.ch and we will help.

Source: Hello Hossy, checked 22.10.2026. Small differences between items are possible.