Baby skin is a wonder—soft and silky to the touch. It's one of the many reasons newborns are so adorable and huggable. But it's not uncommon for babies to develop rashes, especially on their necks.

Cornstarch may help improve mild cases of diaper rash. Cornstarch absorbs moisture, reduces friction, and creates a protective barrier against irritants; however, it should not be used to treat a rash ...