If the baby’s development is delayed, it belongs to acquired factors and can catch up with normal children; if it is congenital factors, it may be difficult to catch up with normal children. 1. Acquired factors: such as malnutrition, infectious diseases, poor living environment, etc. Generally, after treatment or improvement of the environment, the baby’s growth and development can be the same as that of a normal child. 2. Congenital factors: such as growth defects, genetic mutations during the development of the baby in the womb, congenital heart disease after birth, mothers taking medication during pregnancy, being exposed to X-ray irradiation or poison, etc., which may be difficult to treat after the birth of the baby, and even if they are cured, they may still have difficulty in catching up with normal children. There are many specific causes of developmental delay in babies and it is advisable to visit the hospital promptly to identify the cause.