Whether you're stocking up before baby arrives, making sure you have the right fit, or packing for vacation, our diaper size chart will help you plan.

"The goal is to feed your baby the amount of formula they need in order to progress along a healthy growth curve over time," says Liz Donner, M.D., a pediatric hospitalist and member of the BabyCenter ...

To know if a baby (of any age) is well-hydrated and eating enough, check their diapers. We've got tips for newborns and older babies, and even what you need to know about poop.

In addition, don't be alarmed if your baby seems be feeling lighter in weight during the first week of feeding. Nearly all newborns initially lose up to 10% of their birth weight almost immediately.

When you have a baby, diapers are a must-have item. However, diapers can be expensive. If you're struggling to afford them for your baby, some resources may be able to help.