Eating bird\’s nest during pregnancy is the first choice for mothers. When is the best time for pregnant mothers to eat bird\’s nest? Some people say that bird’s nests should not be eaten in the first three months of pregnancy; some say that bird’s nests should be eaten less in the last three months of pregnancy to avoid excessive obesity; some experts say that bird’s nests during pregnancy preparation are beneficial to the combination of sperm and egg cells. There are many answers. Which one is the best? choose? We know that bird\’s nest is rich in sialic acid, which is an important component of brain gangliosides and is a brain nutrient that acts on brain cell membranes and synapses. Sialic acid is helpful for the brain development of fetuses, infants and young children, and promotes the development of children\’s memory and intelligence. Fetal brain development has a critical period in the early, middle and late pregnancy. The development of the fetal nervous system is mainly completed in the first trimester (between 6 and 10 weeks), and the later period is mainly the process of brain enlargement. It can be seen that early pregnancy is the peak period of neurological development and the first critical period for brain development. In the second trimester, the baby develops rapidly between 17 and 20 weeks, which is characterized by the fetal brainstem, nerve roots and brain tissue. At this time, brain development enters the second critical period. 200 Examples of Nutritional Recipes for Pregnant Women for Three Months Ultra-clear, Full-Color PDF In the third trimester of pregnancy, fetal brain cells rapidly proliferate, differentiate, and increase in size between 26 and 30 weeks. This marks the third critical period of fetal brain development. Although fetal brain development is basically completed, neuronal development continues until after birth, affecting the development of vision, hearing, smell, taste, vestibular sense, and movement sense. Studies have shown that during pregnancy, in addition to vitamin supplements and folic acid, bird\’s nest and its sialic acid should also be supplemented, which can not only provide nutrients for fetal brain cells, but also improve immunity and disease resistance. Will eating bird\’s nest during pregnancy, especially in the late pregnancy, cause adverse effects of excessive obesity? the answer is negative. Eating 3 to 5 grams or even 8 to 10 grams of dry bird\’s nest every day will not cause excessive obesity, because 10 grams of dry bird\’s nest usually contains 5 grams of protein and only 3 grams of carbohydrates, so the human body consumes low calories. In recent years, glycobiological research on sialic acid has shown that sialic acid rich in sperm membranes can regulate sperm function in many aspects, including immune protection, maintaining the stability and integrity of sperm structure, participating in sperm maturation, and regulating sperm-egg recognition. Involved in many aspects such as sperm-egg binding. Therefore, both men and women often eat bird\’s nest during pregnancy preparation, which is beneficial to prenatal and postnatal care. Bird\’s nest is a good nutritional supplement for women during pregnancy preparation, pregnancy and postpartum recovery. It can prevent and treat pregnancy sickness, whiten skin, and improve disease resistance and anti-aging ability.