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Acne in the newborn (also known as acne neonatorum) or baby acne is a common condition that affects roughly 20 percent of newborn babies. Infants usually develop neonatal acne because of stimulation of the baby’s sebaceous glands by lingering maternal hormones after delivery. These hormones cross the placenta into your baby and after delivery they cause the oil glands on the skin to form bumps that look like pimples.