Baby Boy Fashion Dress (Available)Size Chart Size 70 = 3M 6M = Chest 18 Size 80 = 6M 12M = Chest 20 Size 90 = 18M 24M = Chest 22 Size 100 = 3Years = Chest 23 Just ensure your baby chest size. Long always depends on baby chest & dress style. So dont worry about length. Advice: If you think baby healthy then take one size bigger. Origin: CN(Origin) Gender: Newborn baby Material: Cotton Style: Casual Season: Summer