Your 4-year-old may exhibit baby talk sometimes or may start waking you up in the night even though they've slept through the night for a long time. Understands the concepts of numbers—that the number four represents four flowers or four balls. American Academy of Pediatrics. They may even develop imaginary friends. Read our editorial policy to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Common Milestones Seen in 2-Year-Olds.
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