Weight is an important indicator for determining a baby’s physical growth and nutritional status. Normal baby weight increases with age, the younger the weight gain faster, and basically follow a certain growth pattern. A just croaked to the ground of the full-term newborn, its evaluation of the birth weight of about 3 kilograms; general range of 2.5 ~ 4.0 kilograms are normal. Almost every newborn baby in the first 2 to 3 days after birth, there will be a phenomenon of weight loss, the mother do not have to worry too much, is not the baby’s body has any problems, but due to the first few days after birth with the discharge of fetal feces and loss of water, and the amount of milk accordingly ate not enough due to the temporary weight loss, in the medical science called physiological weight loss. Generally in the first 3 to 5 days after birth to the lowest point, the drop can be up to 6% to 9% of the birth weight, but the maximum will not exceed 10%. Later, with the increase in milk intake, weight gradually rise, generally in the seventh to tenth day after birth weight to return to the level of birth. The first year after birth is the first peak of growth and development, weight gain in this year can increase three times, that is, the weight from 3 kilograms at birth to the full age of 9 kilograms! In the first year of life, the growth of the baby is not uniform, generally speaking, the younger the age of the month, the faster the growth rate, with the age of the month, the growth rate gradually slowed down. After the birth of a newborn baby experienced physiological weight loss, then began to grow rapidly, the baby almost one or two a day rate began to gain weight, to the full moon, the newborn baby weight can increase an average of 1 ~ 1.5 kg or so; the first three months after birth, weight gain is very fast, an average of 750 grams per month; the second three months after birth, that is, 4 to 6 months, this time the weight gain compared to the first three months has slowed down, an average of Monthly weight gain of 500 to 600 grams; the third trimester after birth (7 to 9 months), weight gain continues to slow down, the average monthly weight gain of 300 to 400 grams; the last three months of the first year (10 to December), the weight of the average monthly increase of only 150 to 250 grams. But not all babies are so ideal to follow this basic law of growth, some babies will be too fast weight gain, such as to half a year old after each month can also be an average weight gain of 1 kilograms, at this time, the mother should pay attention to, if necessary, need to consult a child health practitioner. Analyze the reasons may be three: 1, baby overfeeding, especially formula-fed baby. Some mothers do not care about the specific situation of the baby, I hope that it can eat every day to finish the amount of its requirements, or the baby cried mom mistakenly thought that it was hungry to give formula, thus causing the baby overfeeding, over time, over-nutrition caused by the accumulation of fat in the body, the weight gain is too fast; 2, the birth of an overweight, such as many of the birth weight of more than 4 kilograms of the baby, the postnatal appetite is very good, the growth rate is also super-fast, will also lead to Excessive weight gain; 3, may be caused by a variety of diseases, including brain diseases, endocrine disorders, metabolic diseases. Therefore, found that the baby weight gain is too fast, should consult a physician in time to find out the cause, and then take appropriate measures, such as avoiding overfeeding, appropriate control of the baby’s food intake, increase the baby’s exercise time and exercise; such as caused by the disease is actively treating the relevant diseases. The baby weight gain problem is more of a slow growth. There are many reasons for the slow growth of baby weight, summarized in the following aspects: 1, intrauterine growth retardation. This type of baby in the mother’s stomach due to various reasons in the uterus caused by poor growth, full-term newborn birth weight of less than 2500 grams, medically referred to as full-term small sample of children. These babies because in the womb did not develop properly, not only its birth weight is less than a normal baby, and its organs may not be well developed, after birth, the function of the digestive organs are relatively weak, small amount of food, digestion and absorption capacity is limited, the growth rate is relatively slow, resulting in slower weight growth; 2, breast milk is not enough, did not add complementary foods in a timely manner. 6 months after the exclusive breastfeeding can not satisfy the needs of baby growth and development, if not in time to add complementary foods, the baby is not able to meet the needs of the baby. Growth and development needs, if you do not give the baby in time to add a variety of nutritious complementary foods, it is easy to lead to the baby’s weight growth slow or even no increase; 3, the milk powder is too diluted. Some mothers do not read the instructions for the preparation of milk powder, the preparation of milk powder is too thin, the baby intake is not enough; 4, poor quality milk powder or low-quality complementary food; 5, a variety of diseases, such as chronic diarrhea, recurrent respiratory infections, congenital cleft lip and palate, congenital heart disease, etc., resulting in excessive consumption and intake is too little. Therefore, the prevention of slow weight gain, first of all, we must do a good job of eugenics, to ensure that the baby in the mother’s body grows well; secondly, reasonable feeding, strongly advocate breastfeeding, timely addition of nutrient-rich complementary foods, the rational allocation of formula; then need to carefully buy high-quality milk powder and high-quality complementary foods, to avoid shoddy products; and finally, to enhance the baby’s physical fitness, and actively prevent a variety of diseases.