Baby Hair 101

Many newborns arrive with a thick head of hair, but they often lose it by 2 or 3 months, says Joanne Cox, MD, medical director of primary care at Children's Hospital Boston. Some infants' hair only falls out on top. A baby's second round of hair can take months to grow in and may be totally different -- but it will probably be the color and texture she'll have throughout childhood. Kids' hair may change again during puberty.