Using soap specifically formulated for infants, gently wash your babys body from top to bottom and front to back, paying special attention to genitals, hands, and the folds in her arms and legs. Avoid using adult soap, as its harsher formula can irritate your babys skin or lead to urinary tract infections. Carefully wash your babys head with a soapy washcloth or, if she has hair, you can use a small amount of baby shampoo