What does aggression look like in children of different ages? Infants The most common complaint with infants is their crying or biting, both signs of aggression. Crying is one way children talk. They let you know when they are happy (coo and babble) or when they need something (cry). We should find out what they need and provide it, whether it be a dry diaper, food, or warm touches. Toddlers In toddlers, the most aggressive acts occur over toys. To adults it looks like fighting, but to children it’s learning how to get along. They have not learned how to say, “Let’s play.” The overuse of a “time-out” or a “thinking chair” can cause children to act more aggressively the next time. However, turning the incident into a punishment or control by force will only cause the child to think of ways to strike back. It may help to ask the child to rest from the activity that creates aggression.