The causes of delayed physical development include malnutrition, certain diseases and heredity, etc. It is necessary to find out the causes of delayed physical development before treating the symptoms. 1. Malnutrition: If the baby is picky about food and the nutrition is not comprehensive, resulting in iron, zinc and calcium deficiency, the physical development can be affected. Usually do not picky eating, should be balanced diet, can actively supplement calcium, correct anemia and so on. 2. Heredity: delayed physical development has a certain relationship with heredity, inborn conditions can not be changed, only by strengthening nutrition, appropriate exercise, etc., to promote the growth and development of the organism. 3. Suffering from certain diseases: such as dwarfism, hypothyroidism, etc., you can go to the endocrinology department to check the growth hormone, thyroid hormone, etc., to find out the causes of physical retardation, targeted treatment, and if necessary, growth hormone supplementation.