Finding the right diaper size is more of an art than a science, as it relies on your baby's weight and unique body shape rather than their age. The Weight-Size Standard
Note: Brands like Pampers and Huggies offer sizes up to 7 or 8 for older toddlers. 5 Telltale Signs to Size Up Diaper Size Chart by Weight | Huggies® US how do you know what size diapers to buy
While every brand—from Huggies to Pampers —has its own specifics, most follow a standard weight-based numbering system: Diaper Size Typical Weight Range (lbs) Up to 6 lbs Newborn (N) Up to 10 lbs Size 1 8–14 lbs Size 2 12–18 lbs Size 3 16–28 lbs Size 4 22–37 lbs Size 5 Over 27 lbs Size 6 Over 35 lbs Finding the right diaper size is more of