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Developmental milestones [3] [4] Age Motor Speech Vision and hearing Social 1–1.5 months When held upright, holds head erect and steady.
Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood. [1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age. [1]
Newmeyer suggests parents download the CDC's free milestone tracker app, which can help parents keep tabs on their child's development from ages 2 months through 5 years old.
By age 4, children are able to use sentences of 4–5 words and have a vocabulary of about 1000 words. [131] Children between the ages of 4 and 5 years old are able to use past tense, have a vocabulary of about 1,500 words, and ask questions like "why?" and "who?".
The Gesell Developmental Schedules claimed that an appraisal of the developmental status of infants and young children could be made. The Gesell Developmental Schedule believes that human development unfolds in stages, or in sequences over a given time period. These stages were considered milestones, or the manifestations of mental development. [1]
Developmental delay is prevalent in approximately 1-3% of children under the age of 5 worldwide. [5] According to a systematic analysis done for a conducted study in 2016, there are approximately 52.9 million children worldwide under the age of 5 that are affected by some type of developmental delay or delayed milestone.
He believed that children of different ages made different mistakes because of the "quality rather than quantity" of their intelligence. [4] Piaget proposed four stages to describe the development process of children: sensorimotor stage, pre-operational stage, concrete operational stage, and formal operational stage. [5]
Early passing developmental milestones and the head circumference up to the age of 3 years explained about 6% of variance in IQ in adulthood. In comparison, parental socioeconomic status and the child's sex explained about 23% of the variance in IQ. [18]