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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.
Developmental disability is a diverse group of chronic conditions, comprising mental or physical impairments that arise before adulthood. Developmental disabilities cause individuals living with them many difficulties in certain areas of life, especially in "language, mobility, learning, self-help, and independent living". [1]
Global developmental delay is an umbrella term used when children are significantly delayed in two or more areas of development. It can be diagnosed when a child is delayed in one or more milestones, categorised into motor skills , speech , cognitive skills, and social and emotional development. [ 1 ]
Some synonyms currently in use for specific language impairment are language impairment, developmental language delay (DLD), language disorder, and language-learning disability. Researcher Bonnie Brinton argues that the term "specific language impairment" is misleading because the disorder does not only affect language, but also affects reading ...
Language delay is a risk factor for other types of developmental delay, including social, emotional, and cognitive delay. Language delay can impact behavior, reading and spelling ability, and overall IQ scores. Some children may outgrow deficits in reading and writing while others do not. [21]
Studies show that being placed in erratic environments with few contingencies may cause a child to have conduct problems and may lead to depression. (see Behavioral Development and Depression below). [32] [33] Research continues to look at the effects of learning-based attachment on moral development. Some studies have shown that erratic use of ...
The scientific study of the causes of developmental disorders involves many theories. Some of the major differences between these theories involves whether environment disrupts normal development, if abnormalities are pre-determined, or if they are products of human evolutionary history which become disorders in modern environments (see evolutionary psychiatry). [5]
The difference in skill levels required for each of these tasks ranges from about age 2 + 1 ⁄ 2 to age 4 + 1 ⁄ 2. Further, informal checklists lack psychometric scrutiny so we don't have proof that asking about color knowledge is even a good predictor of developmental delays.