乳房是女人的第二张脸。和人一样,乳房的一生也同样伴随着成长、成熟和衰老三个过程。20岁的乳房在此期间,女性的乳房脱离青涩,新陈代谢开始缓慢,并逐渐习惯成人的重量。一旦女性增重或者减肥,乳房大小也会随之改变。除此之外,怀孕也会改变乳房大小。在二十几岁时,许多女性会怀孕,胸部也会增大,为哺乳做准备。同时,怀孕还会使女性的乳晕颜色变深,乳头增大,这些变化都会在产后恢复到原来的状态。女性在这个年龄由于要处理月经周期的变化,这意味着她们的雌激素会产生差异,从而 Breast is the woman’s second face. Like people, breast life is also accompanied by growth, maturation and aging of the three processes. 20-year-old breast During this period, women’s breasts from Sentimental, metabolism began to slow, and gradually accustomed to adult weight. Once women gain weight or lose weight, breast size will change as well. In addition, pregnancy can change breast size. In their twenties, many women become pregnant and the chest increases, preparing for lactation. At the same time, pregnancy will make the female areola color darker, nipple increases, these changes will be restored to their original postpartum state. Women at this age due to the menstrual cycle to deal with changes, which means that their estrogen will be different, and thus