Physical developmental delay: Some children with congenital developmental delay have abnormal appearance and posture. For example, children with congenital stupidity have wide eye distances, slanted eyes, collapsed nose, tongue often dragging outside the mouth, and drooling. Children with hydrocephalus have very large head circumferences, and children with microcephaly have very small heads. Children with hypothyroidism are particularly short, and children with phenylketonuria have abnormally white skin and lighter hair.
运动 development retardation: Children with developmental retardation are significantly retarded in 运动 development than normal children. The starting age of prone, head-up, sitting, standing, and walking movements is later than that of normal children of the 相同的 age. In particular, walking is more obvious, often not until 3-4 or 4-5 years old before walking on their own, and the walking is unstable.

Lagging language development: Normal babies will imitate their voices when they are 7-8 months old, they will call parents when they are about one and a half years old, they can say 10 words when they are one and a half years old, and they can understand simple instructions, about two years old. Will ask simple questions. Basically, I can express my thoughts around 3 years old. Those who are four or five months behind, or even 1-2 years behind, have these performances and should be considered as 体征 of mental retardation.
Mental retardation: The earliest 症状 of developmentally retarded babies are usually difficult to feed, unable to suck, and are especially prone to vomiting, indicating that the nervous system is damaged and future intelligence will be affected.
Mental development lag: If one of the indicators of height, weight and head circumference is low, it means that the child may have some developmental delays. You can further check the cranial nerves or endocrine items to understand whether the child's physical development is affected.
Parents must not be careless in the growth and development of their children. If the child has the above 症状, he should go to the hospital for examination in time to prevent the child's developmental delay from causing irreversible consequences.