Finding the right size diaper for your baby can be tough. They grow quickly, grow in different directions, and the diaper size that worked yesterday may not work today! Since baby can go through more than 70 diapers per week, it's important to invest time in finding the right size diaper at each stage of your baby's growth. Diaper sizes vary across manufacturers. This handy Diaper Sizes Guide will help you find the right size diaper for your growing baby.