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A late talker is a toddler experiencing late language emergence (LLE), [2] [3] which can also be an early or secondary sign of an autism spectrum disorder, or other developmental disorders, such as fetal alcohol spectrum disorder, attention deficit hyperactivity disorder, intellectual disability, learning disability, social communication disorder, or specific language impairment.
Vocabulary development during the school years builds upon what the child already knows, and the child uses this knowledge to broaden their vocabulary. Once children have gained a level of vocabulary knowledge, new words are learned through explanations using familiar, or "old" words.
The vocabulary of a 1–2 year old should consist of 50 words and can be up to 500. Gestures that were used earlier on in development begin to be replaced by words and eventually are only used when needed. Verbal communication is chosen over nonverbal as development progresses. [38] 2–3 years of age:
Typically grows at a similar rate to the previous month, usually growing between 1 and 1.5 inches (2.5 and 3.8 cm) and gaining about 2 pounds (910 g). [23] Resting heart rate is usually between 80 and 160 beats per minute, and it typically stays within that range until the infant is about one year old. [18] Motor development
Baby sign language is the use of manual signing allowing infants and toddlers to communicate emotions, desires, and objects prior to spoken language development. [ 1 ] [ 2 ] With guidance and encouragement, signing develops from a natural stage in infant development known as gesture . [ 3 ]
The Bayley Scales of Infant and Toddler Development (version 4 was released September 2019) is a standard series of measurements originally developed by psychologist Nancy Bayley used primarily to assess the development of infants and toddlers, ages 1–42 months. [1]
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