There are several kinds of developmental delays a child may experience, some of which have biological causes, others may be environmental in nature. Such delays can be grouped into mental, physical, behavioral and speech.
Mental (or cognitive) delay is related to intellectual function and learning disabilities but also affect communication and interaction. It can be caused by brain injury or chromosomal disorder.
Physical delays can cause the slow development of motor skills, either coordination of the large muscle groups – arms and legs, or small muscle – the hands and fingers. Genetic conditions may also play a part here.
Behavioral delays can affect social and emotional processes. They may result from autism spectrum disorder and attention deficit hyperactivity disorder. They will affect a child’s ability to learn and interact.
Finally, speech development delays can be a sign of several other developmental deficiencies or can result from them. They may also result from either physiological causes or environmental.