Baby hair thinning, part of the physiological, another consideration is the lack of vitamins, lack of trace elements, anemia and other factors. 1. Physiological factors: part of the baby hair thinning and by genetic factors have a relationship, hair thin, but shiny, and the baby growth and development, usually with the development of the baby grows up, the hair situation will gradually improve. 2. Lack of vitamins: lack of vitamin A, vitamin D and B vitamins may affect the baby’s skin and hair growth, resulting in thinning, dry or yellow hair. 3. Lack of micronutrients: most commonly found in zinc deficiency, zinc-deficient children, often thinning hair, no luster and accompanied by loss of appetite, partiality, slow growth and development. 4. Anemia: malnutrition anemia is also a common nutritional problem during the growth and development of babies, iron deficiency anemia and vitamin B12 and folic acid deficiency anemia can be caused by, will lead to yellow skin, hair sparse, dry and without luster. If not improved in time, it will affect the growth and development of the child. There are many causes of thinning hair in babies, it is recommended to combine the overall development of the baby to assess whether there is a nutritional deficiency, and regular physical examination to clarify the nutritional status, under the guidance of the doctor to regulate the condition, to ensure that the baby’s healthy development and growth.