Some children will be taller, some will be more developed, some boys will have changing voices while others won’t. “This is all a normal part of going through adolescence, but it might seem a little more sudden,” Dr. Josefson said.

Families should talk with children about how these changes are normal, about how everyone’s body changes, but not in unison. Dr. Coble suggested, “start with the basics, how are you eating, how are you sleeping?”