Pregnant women need to eat more alkaline foods, such as cabbage, cucumber, carrot, spinach, cabbage, lettuce, taro, kelp, citrus, figs, watermelons, grapes, raisins, strawberries, millet, coffee, wine and natural green algae. Pregnant men need to eat more acidic foods, such as egg yolk, cheese, dessert, sugar, tuna, flounder, cheese, western pastry, mullet roe and firewood. It should be noted that from a medical point of view, the pH value of the human body is relatively constant, and it is impossible to have a big deviation because of which food to eat. There is no scientific basis for saying that drinking alkaline water and eating alkaline food can change the pH of the body and become an "alkaline constitution", which can increase the chances of having a boy.