Calculation of the expected date of labor: The month of the last menstrual date plus 9 or minus 3 is the number of months of the expected date of labor; the number of days plus 7 is the number of days of the expected date of labor. Since the length of each woman’s menstrual cycle varies, there may be a 1-2 week error between the calculated expected date of labor and the date of delivery. Prenatal checkups: 9 times is the best In addition to one checkup in early pregnancy to confirm pregnancy, about 9 prenatal checkups are needed from mid-pregnancy to full-term pregnancy. Generally speaking, from 20 weeks to 36 weeks of pregnancy, one checkup every 4 weeks; after 36 weeks of pregnancy, one checkup every week; the nine checkups are at 20 weeks, 24 weeks, 28 weeks, 32 weeks, 36 weeks, 37 weeks, 38 weeks, 39 weeks and 40 weeks respectively. Regular prenatal checkups are usually nine times, but for pregnant women with certain high-risk factors, it may be necessary to increase or decrease the number of checkups and programs at any time. Weight gain during pregnancy should not exceed 15 kg Women with normal pre-pregnancy weight can gain 11.25-15 kg during pregnancy. Women with low pre-pregnancy weight may gain 2.6-18 kg during pregnancy. Women with heavy pre-pregnancy weight should have a controlled weight gain of 6.75-11.25 kg during pregnancy. Weight gain during pregnancy affects the growth rate and weight of the fetus. Excessive and rapid weight dirty home during pregnancy will not only increase the incidence of macrosomia, but will also make it more difficult to lose weight after delivery. On the contrary, if the weight gain is too little, it will affect the normal growth and development of the fetus. Drugs for pregnant women: 5-10 weeks of menopause is the most dangerous In the first 2 weeks of conception, the fertilized egg may have two endings if it receives the effects of drugs: one is spontaneous abortion; the other is that the fertilized egg repairs the damage by itself and continues to develop into a normal fetus. Therefore, if a pregnant woman accidentally takes medication at this stage, she can adopt a wait-and-see attitude and let nature take its course. However, 3-8 weeks (i.e., 5-10) weeks after conception is a critical stage in the differentiation and development of embryonic organs, and if you are exposed to harmful drugs at this time, the embryonic organs may be teratogenic as a result. Since the effects of most drugs on the fetus are concentrated in the early stages of pregnancy, when a considerable number of pregnant women are still unaware that they are pregnant, in order to ensure safety, expectant mothers should begin to consider the safety of medication at the stage of preparing for pregnancy. Full-term labor: 37 weeks of pregnancy to less than 42 weeks of delivery Premature labor: 28 weeks of pregnancy to less than 37 weeks of delivery. Postmature labor: Delivery at or beyond 42 weeks of gestation. If the baby is born at 38 weeks of pregnancy, it is considered a full-term labor even though it has not reached the expected date of delivery (40 weeks of pregnancy). Newborn weight: Normal is 2500-4000 grams A birth weight of 4000 grams is called a macrosomia. The birth weight of 4,000 grams is called a macrosomic baby. A macrosomic baby not only increases the rate of obstructed labor and cesarean section, but also increases the weight gained during pregnancy, which makes the pregnant woman feel uncomfortable, increases the rate of pregnancy complications, and makes it very difficult for her to lose the extra weight after giving birth. Low birth weight babies are mainly preterm babies and small children. These children have many complications and a high perinatal mortality rate due to their “congenital insufficiency”. In order to eliminate this phenomenon, it is very important to have regular checkups to detect problems and intervene in a timely manner. Newborn length: full-term about 50 cm The height of the child in the first year of life is the fastest growing, annual growth of about 25 cm. 1 year old after the growth rate slows down, annual growth of about 10 cm. 2 years old after the growth of even slower, the average annual growth of 5 cm. 2-3 years old pediatric height formula: height = age * 6 + 77 cm. If the height of a 2-year-old child does not increase much in a year, you should be vigilant and take your child to the hospital as soon as possible to rule out growth hormone secretion, hypothyroidism and other problems. Emergence of milk teeth: at 6 months, the first milk teeth erupt Pediatric teething is generally 6-7 months, there can be earlier than 4 months, the latest not more than 10 months. There are 20 milk teeth, which come out at the latest at the age of two and a half years, and the permanent teeth start to come out at the age of six years. 11-month-old children without teeth, or children over two and a half years old without teeth are abnormal, and the cause should be identified. Children with cretinism, rickets, and malnutrition are late teething. The best period of treatment for “terra incognita”: 4 years old The principle of correcting “terra incognita” is to eliminate the cause of the disease and prevent deformity by early correction. Foreign orthodontists advocate that the treatment of “circumcision” should start at the age of 4 and continue until the age of 18. Breast teeth period of “parietal” is very harmful, not only will hinder the normal growth and development of the child’s oral cavity, face and jaw, but also on the child’s chewing, pronunciation, social, and even psychological impact, should be treated as soon as possible. Precocious puberty: girls before the age of 8 years old breasts began to develop or menstruation before the age of 10 years old, boys before the age of 9 years old penis, testicular enlargement In addition to organic lesions (intracranial tumors) caused by precocious puberty need to be directed at the primary disease for treatment, precocious puberty is the biggest danger to the child is to grow taller, because of sex hormones secretion will make the skeleton early closure. In addition, from the social point of view, precocious puberty will bring to the children of the psychological impact of the abdominal side. Over-nutrition, blind supplementation is the cause of children’s precocious puberty more and more important reasons. Parents should not be afraid of children’s nutrition is not enough, and constantly give the child indiscriminate nutrition, indiscriminate eating supplements, so as not to “love into harm”.