Growth retardation is a slowing down or abnormal sequence in the growth process. The incidence is between 6% and 8%. Early manifestations of developmental delay Early developmental delay is not obvious and difficult to detect, some delays can gradually catch up with the normal level of development with growth and development, if there has been a lag phenomenon, should pay great attention to. 1.Baby is easily frightened and cries more than 3 months 2.Baby’s cry is sharp or weak 3.Baby can’t lift his head at 3 months 4.Baby can’t play with his hands at 4 months 5.Baby can’t roll over at 6 months and won’t take the initiative to grab toys 6.Baby can’t sit at 8 months and won’t fetch things with his fingers 7.Baby can’t crawl at 10 months and won’t knock with his hands 8.Baby can’t stand at 12 months 9, baby 15 months still can not walk steadily, can not consciously call “Dad, Mom” 10, baby 2 years old still can not run, can not hold their own cup of water, can not eat by themselves with a spoon 11, baby 2.5 years old still can not jump, still only call “Dad, Mom ” important indicators of growth and development 1, physical development Weight is the most important indicator reflecting the physical development of children, the baby’s weight grows fastest within 3 months, generally 600-1000 grams per month; height reflects the long-term nutritional status of children, the baby’s height grows fastest within a year, generally 25 cm per year; head circumference is an important indicator reflecting the child’s Head circumference is an important indicator of brain development, the average head circumference at birth is 34 cm, the average 46 cm at 1 year old; chest circumference can also reflect the physical development of children, the baby’s chest circumference and head circumference equal at 1 year old. 2, gross motor development refers to head lifting, rolling over, sitting, crawling, standing, walking, jumping and other motor development, is the most basic human posture and mobility development, is the basis of other development, has an important position, infancy and early childhood gross motor development, can well reflect the central nervous system development, gross motor assessment screening is the most important element to detect whether there is developmental disorders or brain damage in children. Fine motor development refers to the child’s ability to accomplish specific tasks with the cooperation of perceptual, attentional and other mental activities through the movement of small muscle groups in the hands and fingers. Children complete many activities such as fetching, drawing, writing, self-care, etc. Fine motor development is not only an important basis for these activities, but also one of the important indicators for evaluating the maturity of infants’ neurological development, and is the basis for early intellectual development of infants. Language development Language is a tool for human communication and an instrument for expressing ideas. The development of pediatric language is also known as language acquisition, and language development reflects the state of mental development and brain development. 5.Psychological development refers to the overall process of psychological generation and development of individuals from birth to maturity, aging and death, mainly including the cognitive development of children, the development of children’s emotions and emotions, the development of children’s personality, and the development of children’s social interaction. The harm of delayed treatment and improper treatment 1, miss the best time for treatment, resulting in baby development has been lagging behind the normal development order 2, has been lagging behind the development of the baby’s neurodevelopment, directly affecting the overall development 3, long-term backward formation of pervasive developmental disorders 4, the overall movement is not coordinated, unable to participate in sports activities 5, hand function is limited, self-care needs some help from parents 6, language expression and understanding disorders 7.Long-term communication disorder, resulting in closing oneself and forming stereotypical behavior What are the main developmental screening tests? The most widely used and popular developmental screenings at home and abroad are Gesell, Denver, DDST, etc., all of which evaluate the developmental level of infants and toddlers in the gross motor function area, fine motor and object function area, personal and social function area, language function area, etc. Parents should have a developmental screening every 2-3 months.