Size Guide

Helping you find the perfect fit for sweet dreams

All our sleepwear is made using high-quality cotton sourced from Taiwan. It’s soft to the touch, breathable through the night, and gentle on delicate skin — everything your child needs for a restful, cozy sleep.

Use the chart below to choose the most comfortable fit based on age, height, and body measurements. All sizes are in centimetres.

Size (Label)	Age Range	Height (cm)	Inseam (cm)	Chest (cm)	Waist (cm)	General Size
104 / 4Y	3 – 4 years	98 – 104	40 – 44	54 – 56	51 – 54	XS
116 / 6Y	5 – 6 years	110 – 116	44 – 52	56 – 60	54 – 57	S
128 / 8Y	7 – 8 years	122 – 128	52 – 60	60 – 64	57 – 60	M
140 / 10Y	9 – 10 years	134 – 140	60 – 68	66 – 70	60 – 63	L
152 / 12Y	11 – 12 years	146 – 152	68 – 72	70 – 74	63 – 66	XL

Fit Notes

Our sleepwear is made for comfort. The fabric is naturally soft and breathable, perfect for all seasons and sensitive skin. We recommend a relaxed fit for ease of movement during sleep. If your child is between sizes or prefers extra room, choosing the next size up is a good idea.

Still unsure?

Reach out to us at support@nummiy.com and we’ll be happy to help guide you to the right fit.