What are the symptoms of developmental delay in children?

Children's stunting is mainly divided into physical retardation and mental retardation. Physical retardation includes height and weight. When the height and weight values are lower than the tenth percentile of the same age group, it belongs to stunting, or the growth curve is in a gradual or gradual decline process for several months. Mental retardation is mainly evaluated through various intelligence assessments, such as children's neuropsychological development assessment, when the evaluation score is less than 85 points, it indicates mental retardation, or the test month age development is lower than the normal month age for more than two months, belonging to developmental retardation, for example, the baby still won't stand alone at 15 months, won't say father, mother, don't know what to give, don't know how to wear clothes, this belongs to mental retardation performance.