As the rest of your body changes during pregnancy, your breasts change too, getting themselves ready to make and supply milk for your baby. Your breasts will get bigger. They may be sore sometimes. Your nipples may change color. It's all a natural part of being pregnant.
With all the bliss that comes with becoming a new mom come some pitfalls. Fear not. For most women, the breasts as a whole will get bigger while the nipples will experiences changes in size, shape, and sensitivity. Typically, they will get progressively larger and darker and form little bumps called Montgomery tubercles. Hormonal changes, increased breast tissue production, and fat storage play a part in both breast and nipple changes.
For most but certainly not all women, pregnancy acts like a surgery-free breast enhancement without any scars — unless you count the stretch marks. In just the first few months, some women may find their breasts swelling a cup size or more, and sometimes the largeness lingers long after the baby is born. Pregnancy hormones, chiefly estrogen and progesterone, are to thank for the bountiful boob job.