3 years: Children begin to know about minds and mental states {cognition development, 3 years}. Competitiveness starts. Children do not notice stimulus changes or single out stimulus parts.
36 months: Children can repeat words that they hear {echolalia}.
3 years: Children no longer need mother present {emotion development, 3 years}.
36 months: Children can use four-word sentences {language development, 36 months}. Sound articulation improves greatly. Verbal mediation begins. Children have 900-word vocabularies, can use 100 words, have frustration if not understood, use five-word phrases, have good understanding, and have adult grammar.
3 years: Boys and girls are same size, 0.95 meters and 15 kilograms {physical development, 3 years}. All baby teeth are present. Children can run and turn smoothly, jump up 30-centimeter stairs with both feet, stand on one foot for one second, build towers of 9 to 10 cubes, fold paper in half but not diagonally, and draw less repetitively. Children sleep 20% in REM sleep.
3 to 10 years: Average height does not differ between boys and girls {physical development, 3 to 10 years}. However, height variation for 10-year-old boys is 26 centimeters.
3 to 4 years: Children can understand described situations but cannot apply learning to actual situations {cognition development, 3 to 4 years}. They can perform Piaget's class inclusion task if it slightly changes. They can match objects explored by touch or vision. They construct coherent value systems, using model codes or people.
reasoning
They do not necessarily reason as expected, because context is more important to them, and premises can lack enough context. They can reason deductively about spontaneous activities. They can make comparisons that depend on transitive reasoning: if a = b, and if b = c, then a = c.
reality
Children cannot separate appearance, what something looks like, from reality, what it actually is. They know only real world and do not fantasize or pretend.
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Description of Outline of Knowledge Database
Date Modified: 2022.0225