The causes of small but not loud cries in newborns usually include abnormal development of the vocal cords, incomplete development of the heart and lungs, etc., which require prompt medical treatment. Some newborns may have poor nutritional absorption during the fetal period due to poor development in the mother’s body, which may lead to abnormal development of the newborn’s vocal cords, resulting in the phenomenon of a small but not loud cry, but it will generally improve and recover gradually with the newborn’s growth and development. In addition, if the newborn’s cardiopulmonary insufficiency may also cause the newborn’s cry is small, because when the heart blood supply is insufficient or pulmonary insufficiency will easily lead to the newborn’s circulating blood volume is reduced or the lung capacity is reduced, which will affect the newborn’s state of health. There may be other reasons why a newborn baby’s cry is small and not loud, so it is recommended that you go to the hospital in time for a complete examination to determine the cause of the problem, and then give targeted treatment under the guidance of the doctor.