Toddler Tantrums: Everything You Need To Know A toddler is a child aged 1 to 3 years which is a time of great cognitive, emotional as well as social development but is also a time of tantrums. Toddler tantrums is basically a way of the child expressing his/her frustration & can be quite unpleasant, embarrassing and sometimes difficult for a first timer parent to handle. To be able to understand what this is a parent needs to first understand why the child is upset.