You need to try and identify possible causes. Look at things like the type of linen you use for your baby, the washing powder and fabric softener you use, your body lotions and perfumes, pets in the home, air conditioner and heaters in the home, the quality of your tap water, the baby soap, shampoo, body moisturizers, and other products you use for your baby. If the scratching persists after you have ruled out possible causes, the best advice is to consult your pediatrician. Never be afraid to discuss issues with your doctor concerning the wellbeing of both yourself and your little one.