Aggression in these toddler years is so common when kids don't have the skills to share frustrations in a more appropriate manner, especially early on when even language skill is so minimal. Erin covers both ends of the toddler spectrum and aggression, giving tip for helping a mom with a 13 month old who can get aggressive when she doesn't get her way and also for the parents of 3, almost 4 year-old, also when he doesn't get his way!