Under normal circumstances, a baby’s voice should be clear and loud. If the baby’s voice is small and hoarse at birth, it is mostly considered to be congenital diseases, such as congenital laryngeal webbing and congenital laryngeal cleft. 1. Congenital laryngeal webbing: the front part of the larynx fails to separate during the development of the larynx 8~10 weeks before the embryo, that is, the entrance of the larynx fails to open. When the laryngeal webbing is small, the cry may be muffled. 2. Congenital laryngeal cleft: mostly occurring at the back of the larynx, mild laryngeal cleft is usually asymptomatic, severe laryngeal cleft can appear cry little or no sound, at the same time the baby will be accompanied by laryngeal tinnitus, dysphagia, choking cough, respiratory difficulties, recurrent episodes of pneumonia and bronchitis, if the treatment is not enough, often due to pneumonia, pulmonary atelectasis and death. Should improve the laryngoscopy and other related examinations in a timely manner, a clear diagnosis, and targeted treatment under the guidance of a professional doctor. The small hoarse voice of babies at birth is mostly caused by diseases, and it is recommended to consult a doctor in time to be evaluated and treated by a specialized doctor.