Key skills or abilities that most children achieve by certain ages as they grow. These milestones cover various areas of development, including physical, cognitive, social and emotional growth. Examples include learning to roll over, sit up, walk, talk or solve simple problems. Achieving these milestones helps children build the foundation for more complex skills in the future. Occupational therapy can support children who may be delayed in reaching certain milestones, offering strategies and activities to encourage development and help them catch up to their peers.