“Doctor, I especially like to eat sour food after pregnancy. Am I pregnant with a boy?” First of all, it needs to be clear that the baby’s sex is determined by the sex chromosome. There is only one X chromosome in female eggs, while there are two kinds of chromosomes in male sperm: X and Y. therefore, the baby’s sex is determined by the father’s chromosome. Therefore, it is impossible to determine the baby’s gender according to the pregnant mother’s preference for sour or spicy diet. < / P > < p > “why do my eating preferences change after pregnancy Pregnant mother likes acid because of the chorionic gonadotropin secreted by the placenta after pregnancy, which can inhibit the secretion of gastric acid, reduce the activity of digestive enzymes, and affect the gastrointestinal function, resulting in nausea and vomiting, loss of appetite and other early pregnancy reactions. Sour taste can stimulate gastric juice secretion, improve digestive enzyme activity, promote gastrointestinal peristalsis, increase appetite, and is conducive to food digestion and absorption. Therefore, many pregnant mothers prefer acid food during pregnancy. Because of their different eating habits, some pregnant mothers prefer spicy food, believing that the more spicy the better their appetite. However, spicy food is easy to over stimulate the gastrointestinal tract, which is not conducive to maternal health and baby development. From the point of view of nutrition, oxytocin is also more conducive to fetal growth and development. During 2-3 months of pregnancy, fetal bone begins to form, and the main component of skeleton is calcium. Acid substance can make free calcium form, calcium salt can deposit in bone, which is conducive to the formation and development of fetal bone; acid substance can also help iron absorption, convert trivalent iron into divalent iron, and promote hemoglobin formation; vitamin C is the necessary nutrient for pregnant women and fetus, which can strengthen the mother Body immunity plays an important role in the formation of fetal cell matrix, cardiovascular growth and development, and the formation of hematopoietic system. However, most foods rich in vitamin C are acidic. < p > < p > therefore, in the choice of food for expectant mothers, it is better to have both sour and nutritious food, such as tomatoes, hawthorn, citrus, sour jujube and other fresh vegetables and fruits, which can not only improve the symptoms of gastrointestinal discomfort, but also increase appetite, strengthen nutrition, which is conducive to fetal growth.