Regardless of a girl’s age, her parents are often unprepared for the emergence of breast buds, and may be particularly concerned because at the onset of puberty, one breast often appears before the other. According to Dr. Suzanne Boulter, a pediatrician and adolescent-medicine specialist in Concord, New Hampshire, “many mistake them for a. Breasts, nipples and areolae are evident from the day we are born, on both girls and boys. There is very little actual breast tissue present at birth, although a few days after birth it is not at all unusual for babies to produce what is referred to . As breasts start to grow, a girl will have small, firm, sometimes tender lumps (called breast buds) under her nipples. In some cases one breast will start to develop weeks or months before the other; the breast tissue will get larger .