Is the size 5 baby suit 80 or 90

Size 5 children's clothing is the size for a height of 90cm.

Size 5 for children's clothing refers to the height of the child corresponding to the child's age, that is, the size for a 5-year-old 90cm child. Size generally refers to the size of clothing, the fatness of clothing, shoes and socks, and the size of certain parts of the human body. There are two common ways to mark the size of clothing: one is S (small), M (medium), L (large), XL (extra large); the other is the form of height plus chest circumference, such as 160/80A, 165/85A, 170/85A, etc.