A scaly, red, itchy, dry rash can show up in the first weeks of life. It signals a vexing but treatable skin problem called atopic dermatitis (AD), often known as eczema. Most children outgrow AD, but in some cases, it may recur in the teenage years or in adulthood.

The top cause of diaper rash is moisture, made worse by chafing or rubbing. That's why it's important to check your baby's diaper often and change it.