Common in children 1-4 years of age as they learn to express desires and fustrations, management focuses on protecting the child and others from harm and helping the child develop appropriate forms of expression.

By this age, a child recognizes parents.

By this age, a child builds a tower of 9-10 blocks and rides a tricycle.

By this age, a child uses 3-word phrases and knows their own name.

Every child with delay in speech milestones should undergo one.

Associated with IDA, this involuntary response to minor injury or anger in which LOC may occur usually resolves by 6 years of age.

By this age, a child displays magical thinking.

By this age, a child walks independently and stacks 2 cubes.

By this age a child vocalizes.

In an abnormal test, when the dominant eye is covered, the weaker eye will move to focus on an object.

While this may occur in infants up to 5 to 6 months of age, persistence may be initially treated with patching and exercises but may also need surgical correction.

By this age, stranger anxiety begins and the child sleeps through the night.

By this age, a child rolls from back to stomach, sits alone briefly, and passes objects between hands.

By this age, half of speech is comprehensible.

Two pharmacologic therapies for enuresis.

Most common in children 3-5 years of age, this phenomenon can occur in REM sleep in up to 50% of children.

By this age, stranger anxiety peaks.

By this age, a child rolls from side to back and holds head up.

By ths age a child uses "mama" and "dada" appropriately.

Physiologic causes for this include dehydration, lack of stool bulk, anal fissue, GI disorders, and metabolic disorders such as hypothyroidism.

This phenomenon is known by the "the rule of 3s": 3 hours a day, 3 days a week, for 3 weeks or more.

By this age, stranger anxiety subsides.

By this age, a child throws a ball and uses stairs with help.

By this age a child develops object permanence and follows 1-word commands.

Workup for this includes a physical exam for features of genetic syndromes, possible chromosome analysis and fragile X testing, lead levels, and testing of cognitive and adaptive skills.