The developmental delay of babies includes: backward physical development, height and weight not up to standard; backward language development; backward mental neurological development. 1, physical development is backward, height and weight do not meet the standard: the baby is not enough nutrition and caused, height, physical development is backward, but the intelligence is normal. At this time to give the appropriate nutrients, increase the amount of milk, increase the intake of fat, protein, carbohydrates, should be able to catch up. The former is able to understand language but not express it; the latter is limited in understanding and expressing language, so after a clear diagnosis, appropriate rehabilitation exercises are given to deal with it. The former requires logical exercises and parental care to achieve half the effect. The latter focuses on training the child’s understanding of language, auditory memory and auditory knowledge, and should go to a specialized language rehabilitation exercise center. 3, mental neurodevelopmental backwardness: genetic metabolic system diseases, ischemic-hypoxic encephalopathy, craniosynostosis, cerebral edema and other causes of craniosynostosis, thus causing intellectual and limb motor dysfunction, need to do cranial magnetic resonance, electroencephalography and intelligence test, once diagnosed to give the corresponding rehabilitation exercises in a timely manner, the earlier the effect of treatment, the better.