Slippers Sizing

Size	Foot length up to (cm)	EU	UK	US
0–6 M	10.2	16–17	0.5–1	Baby 1–2
6–12 M	12.7	18–19	2–3	Baby 3–4
12–18 M	14	20	4	Toddler 5
18–24 M	15.2	22	5	Toddler 6

Size	Foot length up to (in)	EU	UK	US
0–6 M	4.0	16–17	0.5–1	Baby 1–2
6–12 M	5.0	18–19	2–3	Baby 3–4
12–18 M	5.5	20	4	Toddler 5
18–24 M	6.0	22	5	Toddler 6

Measure from the back of the heel to the tip of the longest toe while your little one is standing.
If their foot is close to the limit for a size, choose the next size up so there's room to grow.