Long-held belief on peanuts shattered

Sienna Williams-Van Balen, 8, of Castle Shannon, shows the contents of her purse which include several EpiPens, two different inhalers, and methylprednisolone steroids in case of anaphylactic shock on Feb. 28, 2015 in Castle Shannon, Pa. (Ralph Musthaler/Pittburgh Post-Gazette/TNS)

Reversal of advice on peanut allergies has confounded some doctors and parents.

As a nurse, Amber Williams was well aware of the medical recommendations for starting her daughter on solid foods. She waited until Sienna turned one to give her milk, and was planning to wait until age two to introduce eggs and age three for peanuts.