It is a common occurrence for many newborns develop a blister from vigorous sucking on a bottle or breast called a nursing tubercle. These blister are sometimes present at birth because of thumb-sucking in the womb. A sucking callus causes no discomfort to your baby. In fact, the overgrowth of skin stiffens the lip and may make grasping the nipple easier. The callus will disappear on its own in a few months, or it might come and go from day to day.
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