Here you can find the size charts of the most popular manufacturers

Gap and Old Navy size chart for babys and toddlers under 5 years:

 Gap and Old Navy size chart for children over 5 years:

Carter's ir OshKosh B'Gosh size chart:

Gymboree ir Crazy8 size chart for children under 5 years:

Gymboree ir Crazy8 size chart for children over 5 years:

J. Crew children size chart:

Ralph Lauren children size chart:

Children's place size chart for babys and toddlers under 5 years:

 Children's place size chart for children over 5 years: