This is the child's ability to use large muscles. For example, a six-month-old baby learns how to sit up with some support, a 12-month-old baby learns to pull up to a stand holding onto furniture, and a five-year-old learns to skip.

Concerned your child hasn't reached a milestone?

Children achieve milestones at different times – often related more to temperament than intelligence or ability. Tumblon presents the normal range for its developmental milestones. If you are concerned that your child has not achieved a milestone by the end of the normal range, you should discuss it with your pediatrician.

In addition Early Intervention Support provides evaluation for developmental delays and support services for children with diagnosed developmental delays. Early diagnosis and therapy (which is often free) can help many children overcome their delays. Find early intervention services in your state or ask a therapist.