Pregnancy boobs become very large is not necessarily a daughter. The sex of the fetus is mainly determined by the chromosome of the fertilized egg, the chromosome of the egg is only X. If the sperm chromosome is X, it will be a female baby, if it is Y, it will be a male baby. During pregnancy, because of the rise in estrogen and progesterone, which stimulate the development of mammary gland ducts and alveoli, the breast volume will gradually develop and become larger, the nipple will increase in size, and the coloring of the nipple and areola will deepen. This reaction, regardless of whether you are pregnant with a boy or a girl, will start from the 6th week of pregnancy throughout the entire pregnancy, in order to prepare for lactation, and it has nothing to do with the sex of the fetus. The gender of the fetus is not important, healthy growth and development is the most important, pregnant women are advised to maintain a relaxed and happy mood during pregnancy, strengthen the nutrition, on time for maternity checkups, and if there is any discomfort you need to consult a doctor in a timely manner.