The baby’s throat is often hmmm, consider that it may be caused by hunger, environmental factors, upper respiratory tract infection, bronchitis. 1. Hunger: when the baby is hungry, because he can’t speak, he may express himself through some special sounds or crying. 2. Environmental factors: It may be that the air in the environment where the baby is living is too dry or the temperature is high, which causes the baby to have uncomfortable symptoms. 3. Upper respiratory tract infection: due to viral or bacterial infections often lead to snotty nose, nasal congestion, cough, sore throat and other symptoms of the baby, the throat may make mmmm sounds. 4. Bronchitis: due to pathogens on the bronchial mucosa caused by irritation, resulting in increased secretions and localized edema, there will be coughing, coughing up phlegm, wheezing and other symptoms, the baby is uncomfortable, and may emit hmmmm sound. Baby’s throat often hmmm, may be caused by other reasons, should take the baby to the hospital to find out the cause.