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Children's Health

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Milestones for 3-Year-Olds - Topic Overview

Children usually progress in a natural, predictable sequence from one developmental milestone to the next. But each child grows and gains skills at his or her own pace. Some children may be advanced in one area, such as language, but behind in another, such as sensory and motor development.

Milestones usually are categorized into five major areas: physical growth, cognitive development, emotional and social development, language development, and sensory and motor development.

Physical growth and development

Most children by age 3:

  • Have gained about 4.4 lb (2 kg) and grown about 3 in. (8 cm) since their second birthday.
  • Begin to look leaner as their prominent belly gradually flattens.
  • Have a complete set of baby teeth camera.gif.

To see the high and low percentiles for normal weight and growth, go to

Thinking and reasoning (cognitive development)

Most children by age 3:

  • Know their own name, age, and gender.
  • Follow 2- to 3-step instructions, such as "pick up your doll and put it on your bed next to the teddy bear."
  • Grasp the concept of "two." For example, they understand when they have two cookies rather than one. But they usually aren't yet able to understand the concept of higher numbers.
  • Memorize a string of numbers rather than actually count. The same is true of the alphabet. A child may say the letters from memory but may not be able to recognize a written letter singled out from the others. But some 3-year-olds show great interest in and ability with numbers, counting, and the alphabet.
  • Enjoy working with puzzles that have 3 or 4 pieces. Most children can also sort objects by shape and color.
  • Have active imaginations and a rich fantasy life. For example, they may imagine that their toys or stuffed animals can talk and play with them.

Emotional and social development

Most children by age 3:

  • Experience a wide range of emotions.
  • Separate easily from their parents.
  • Express affection openly. They may show affection for familiar playmates spontaneously.
  • Understand the concept of "mine" and "yours." They may have trouble sharing toys at times or have conflicts when playing with others.
  • Can identify a person as a boy or girl. But they do not yet fully understand the distinctions between genders.
  • Are interested in toilet training. Many stay dry when they are awake.
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