Child Development Milestones

The Department of Health and Mental Hygiene offers information on developmental milestones for parents and caregivers of children of the following specific ages:

  • 2 months
  • 4 months
  • 6 months
  • 9 months
  • 1 year
  • 18 months
  • 2, 3, 4, and 5 years old

The information includes what most babies and children do at each age for the following behaviors:

  • Social/emotional
  • Language/communication
  • Cognitive (learning, thinking, problem-solving)
  • Movement/physical development

You can also get suggestions of when to talk to your child's doctor about your child's development.