The causes of baby shortness have the following points: 1, genetic, baby’s parents or immediate family members among the height of a particularly short, the baby by the influence of genes, so short. 2, low birth weight children, recently the child was born full-term, but weighs less than 2,500 grams, there is no family history of shortness and there is no endocrine anomalies, but there is a change in the rhythm of secretion of growth hormone. 3, nutritional factors, the child’s growth requires Protein, fat, carbon, water compounds and other nutrients, if the baby picky eaters caused by insufficient intake of nutrients, there will be short. 4, sleep deprivation, growth hormone is generated at night after a deep sleep, if the child sleep deprivation will lead to shortness. 5, disease factors, anterior pituitary hypopituitary gland hypopituitary gland will lead to insufficient secretion of growth hormone, resulting in shortness of size, as well as hypothyroidism, will also cause shortness. The hypothyroidism can also cause shortness of size.