The teen years are a time of growth spurts, puberty changes, and emotional and social development. Here's what you need to know.

A helpful look at age-appropriate hearing milestones for babies and toddlers.

Read on to learn about common physical, speech, and other developmental milestones to expect when your baby is this age.

This age is very social, and babies begin moving in much more purposeful ways.

A helpful look at common developmental milestones in young babies.

Read on to learn about the common developmental milestones for babies ages 10 to 12 months.

Flat head syndrome (deformational plagiocephaly) is when a baby's head develops a lasting flat spot. The flat spot may be either on one side of the head or on the back of the head. This happens when a baby sleeps in the same position most of the time or because of problems with the neck muscles.

During puberty, a teen boy will grow taller and heavier, and hormones will lead to sexual maturity. Read on to learn what to expect.

Girls experience puberty as a sequence of events, and their pubertal changes usually begin before boys of the same age. The first pubertal change in girls usually is breast development.

Obsessive-compulsive disorder (OCD) is a type of anxiety disorder. A child with OCD has obsessive thoughts that are not wanted. The thoughts are linked to fears, such as touching dirty objects.