Because the performance of pregnancy will not be the same after pregnancy, so the first child will have breast swelling and pain, the second child may not necessarily also have breast swelling and pain. Some people pregnant with the first child chest will have a feeling of swelling and pain, but the second child does not, this may be different from the individual’s physique and personal feelings are different, this situation do not have to worry, as long as on time maternity check, fetal development is normal, pregnant women’s body hormone levels in the normal range, generally not a problem, and well nourish the fetus on the right, do not have to worry too much about it, pay attention to supplementation, to achieve a balanced nutrition. Some pregnant women will have breast swelling and pain during pregnancy because of the increase in estrogen and progesterone secretion during pregnancy, which will stimulate the development of mammary ducts and mammary follicles, resulting in breast swelling and pain, and mammary hyperplasia, which will prepare for lactation in the future. It is recommended to have regular checkups during pregnancy and consult a doctor if you feel unwell.