Question: what is the average size diaper for a 1 year old?
Answer: Diaper Sizes Size 1 (8-14 lb) - For larger newborns and infants up to 3 months old. Size 2 (12-18 lb) - For infants from 2 to 6 months old. Size 3 (16-28 lb) - For infants and toddlers from 5 months to 2 years old.