This is the child's ability to interact with others, including helping themselves and self-control. Examples of this type of development would include: a six-week-old baby smiling, a ten-month-old baby waving bye-bye, or a five-year-old boy knowing how to take turns in games at school.

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.