A baby’s inability to laugh may be normal until the age of 1 year, but it also needs to be clarified whether the baby is able to make sounds, such as crying out. If your baby is unable to cry out, you need to be on the lookout for conditions such as abnormal vocal cord development. Before the age of 1 year old, most babies will not be able to correctly vocalize, because the baby’s brain is not yet fully developed, the various reflex mechanisms of the nervous system is not perfect, the vocal cords can not control the pronunciation of the vocal cords, at this time will not be able to laugh out loud may just be a normal state. However, if the baby can not cry out during this time, need to be alert to the abnormal development of the vocal cords or laryngeal recurrent nerve injury and other conditions, if necessary, you can go to the otorhinolaryngology consultation. Babies are usually around 1 year old when they start to slowly control their articulation and learn to speak. At this time, if the baby still can’t laugh out loud, he or she may have backward speech development or hearing abnormality, and need to consult a doctor in time. In daily life, in addition to paying attention to the baby’s laughter, you should also pay attention to its hearing, rolling over, lifting up, grasping, breastfeeding, walking, limb movement, etc. Parents should consult the doctor as soon as possible when they find any behavioral abnormality.