Fifteen months baby can not speak is not normal, fifteen months baby should be able to say a few words and their own names, if fifteen months baby can not speak, it may be physiological delay in language development, but also may be hearing impairment, autism and other causes. The baby’s language development is gradual, should be as early as five months in the baby can send out a single syllable, in the baby 7 months can unconsciously send out “dad”, “mom” and other complex sounds, 10 months ~ 1 year old can say words, call out the names of objects, 15 months By 15 months, they should be able to say several words and their own names. If the baby 15 months did not even make a single syllable, then you need to be vigilant, whether the baby has a hearing impairment, autism and other diseases; if the 15-month-old baby can say a single word, but just do not often speak, then it may be caused by physiological language development delay, parents can talk to the baby more to promote the baby to speak. If the fifteen-month-old baby does not speak, it is recommended to consult a doctor in time to identify the cause and follow the doctor’s instructions for treatment.