At 3 months old, the fetus underwent significant changes, reaching a length of 45-63 millimeters and a weight of 14 grams. At this point, the fetus begins to take on human form. At 3 months of pregnancy, the normal mean biparietal diameter of the fetus is 25 millimeters, the normal fetal heart rate is 120-160 beats per minute, and the maximum vertical depth of the amniotic fluid is greater than 2 centimeters and less than 7 centimeters. At three months, the organs of the fetus have already formed, and the first three months are the period of organ formation. It is necessary to increase comprehensive nutrition.
Pregnant women's diet should be diversified in principle, eating more nutritious and easily digestible foods. Protein is the basic substance of life, accounting for about 40% of the dry weight of the human body. Fetal development, uterine and breast hyperplasia in pregnant women require a large amount of protein, so pregnant women should eat more protein containing foods, such as eggs, lean meat, fish, soy products, etc. After the third trimester of pregnancy, the rapid growth of the fetus and the growth of some tissues of the mother require a lot of heat energy, and rice, noodles and other staple foods are the main sources of dietary heat energy for Chinese people. For this reason, pregnant women should increase their intake of standard rice and flour, and consume some miscellaneous grains such as corn, millet, oats, red beans, mung beans, etc.
Vitamins are essential for the human body. In addition to choosing foods rich in vitamins, attention should be paid to avoiding excessive loss of vitamins during cooking. For example, using high heat and fast frying, washing vegetables before cutting, and washing rice moderately can all reduce vitamin loss. Increase the number of meals and eat moderately: Pregnant women can eat 4-5 times a day, and the amount of food each time should not be too much. This can absorb more nutrients without burdening the gastrointestinal tract; Eating some foods to prevent constipation: Pregnant women are prone to constipation in mid pregnancy.
Providing an appropriate amount of inorganic salts is crucial for the health of pregnant women and the development of fetuses. Pregnant women may experience symptoms such as leg cramps, which are usually related to their dietary calcium deficiency. Calcium and phosphorus are always essential elements for fetal bone growth and development. Therefore, pregnant women should choose foods high in calcium, such as white shrimp, crispy fish, shrimp skin, milk, and dairy products. However, it is important to pay attention to a light diet as the burden on the heart of pregnant women increases significantly after three months of pregnancy. Therefore, the diet should be light and refreshing, and should not be too salty or greasy.
