It depends on your baby’s specific situation and cannot be generalized. Babies who have not been born for a long time and whose respiratory and neurological systems are not fully developed may make an erratic sound when breathing, which will decrease or disappear as the baby grows and develops. In addition, if the baby is unhappy and has bad emotions, in order to attract the attention of parents, they will make the uh-uh sound, parents should be concerned at this time. When the baby is sick, such as respiratory tract infection, the throat is uncomfortable and may make an err-er sound, which may cause the baby to have difficulty breathing in serious cases. If it is accompanied by symptoms such as blue lips, you should promptly take it to the pediatrician of the hospital for treatment. When feeding your baby, you should pay attention to a reasonable diet to ensure normal growth and development, drink water appropriately to promote metabolism and improve its ability to resist disease.