Hair loss in children can be caused by genetic factors, or it can be a symptom of some diseases such as malnutrition and seborrheic dermatitis. 1. Heredity: the growth of the child’s hair and various indicators are affected by genetic factors, if the child’s parents have thin hair, easy to fall, the child may also appear similar symptoms. 2. Malnutrition: Children’s digestive and absorption functions are not yet mature, usually if there is a phenomenon of partiality will lead to the child’s intake of nutrients, such as iron, zinc and other deficiencies, resulting in malnutrition. And often affects the development of the child’s hair, the phenomenon of fine hair, sparse. 3. Seborrheic dermatitis: when the child’s head skin lesions such as seborrheic dermatitis, due to the inflammation of the infection can lead to the head skin environment abnormality, thus affecting the development of hair. The child may appear hair loss, erythema, flaking, fine hair, growth affected performance. When the child’s hair is thin and limp and causes discomfort, parents should bring the child to the hospital in time and follow the doctor’s instructions for treatment.