This is the child's ability to both understand and use language. For example, this includes a 12-month-old baby saying his first words, a two-year-old naming parts of her body, or a five-year-old learning to say "feet" instead of "foots".

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.