康医生:我女儿四个月了,最近发现她乳房肿大,好像开始发育了,怎么办?甸甸妈甸甸妈:您好!首先,您女儿目前情况属于正常,不必担心。一般情况下,女孩出生至青春发育成熟,生理情况下有三个年龄段可见乳房发育增大。第一年龄段是新生儿期,由母体雌激素引起。第二年龄段是婴儿期。女婴的卵巢在出生时已具备分沁雌激素的功能, Doctor Kang: My daughter has been for four months. I recently found that her breast enlargement seems to begin to develop. What should I do? Madian Austin: Hello! First of all, your daughter is in normal condition now, and you do not have to worry about it. Under normal circumstances, the girl was born to mature youth, physical conditions, there are three age groups can be seen breast development increased. The first age segment is the neonatal period, caused by the estrogen of the mother. The second age is infancy. The baby’s ovary already has the function of dividing Qin’s estrogen at birth,