You see a 30-month-old named Brian for a well-child visit. His mother reports the following development:
- Physical: Walks independently, runs, able to climb stairs alternating feet, makes a tower of nine cubes, and is able to button his pants.
- Social: Follows one-step commands, uses one-word sentences, and has a vocabulary of approximately six words. He is resistant to nighttime and feeding routines, he has marked temper tantrums, and Mom states he does not calm when she tries to comfort him.