Each stage of baby growth and weight are different, and the reasons affecting the baby’s weight are also different. 1, born baby one month normal weight reference: normal full-term baby is born with a weight of about 2500-3999 grams. In the first 3 months, the baby’s weight growth is 180-200 grams per week, 150-180 grams per week in 4-6 months, 90-120 grams per week in 6-9 months, and 60-90 grams per week in 9-12 months. According to the calculation of weight gain multiples, the baby weighs twice as much at birth at 6 months, about 3 times as much at 1 year, about 4 times as much at 2 years, and about 4.6 times as much at 3 years. 2, newborn weight characteristics: the average weight of the baby at birth is 3.2 kg whole, usually male babies are heavier than female babies, taller and fatter parents, the baby will also be heavier. If the baby’s weight is under the average weight, but not less than 2.5 kg, it belongs to the normal weight of the baby, these newborns are generally fed with other children nothing different, only there are individual children due to small, sucking ability is relatively poor, sometimes tired of eating little milk. Then for such a small baby, the new mother should be more patient, eat mother’s milk, should take the method of eating less and more meals, so that the child’s total milk feeding does not decrease, and is conducive to his digestion and absorption. 3, infant weight growth pattern: weight shows is an important sign of the child’s health, the child’s weight grows regularly, it means that the child is healthy during this period; if the weight does not increase or grows slowly, it means that there may be improper feeding, disease or other reasons. A child’s weight gain is not a linear process, but has a certain regularity. Weight gain is faster in the early years of life, slows down gradually, and then increases rapidly again during adolescence. Generally after 3 months of life, the baby’s weight doubles compared to that at birth, and the child’s weight can increase by 6 kg in the first year after birth, and only about 2-2.5 kg in the second year. After the age of two and before the age of ten, the weight gain is only about 2 kg per year. If the baby’s weight is delayed, parents should go to the hospital for a timely checkup to avoid delaying the baby’s growth and development.