Appointments at Mayo Clinic. Mayo Clinic offers appointments in Arizona, Florida and Minnesota and at Mayo Clinic Health System locations. Infant and toddler health. You might expect your baby's skin to be flawless, but baby rashes and other skin conditions — such as cradle cap — are common. Cradle cap appears as thick, yellow, crusty or greasy patches on a baby's scalp. Cradle cap is most common in newborns and usually clears up on its own by age 6 months.