Normal full-term babies weigh about 2.5-4kg at birth. In the first three months, the baby gained about 180-200g, 4-6 months 150- 180g, 6-9 months 90- 120g, 9- 12g. According to the multiple of weight gain, the baby's weight at 6 months is twice that at birth, about 3 times at one year old, 4 times at two years old and 4.6 times at three years old. In the second year after birth, the average length of the baby is 2.5-3kg, and after two years old, the average length is about 2kg per year until puberty. The development of boys and girls is different. Parents can refer to the baby's height and weight data above to see if the baby's length and weight are normal.

The baby will have different height and weight in each period, and height and weight always indicate the baby's growth. Only when the baby is healthy, the height and weight will be within the standard range, but some parents don't know the standard of the baby's height and weight very well, so that it can't be detected in time when the baby's height and weight are abnormal. Therefore, before the baby is born, parents should know the standard of height and weight of the child.

Parents will pay full attention to the baby from the birth. Parents will care about whether the baby is full and warm, and whether the baby grows up healthily. The healthy growth of the baby can be monitored by the baby's height and weight. Only when the baby's height and weight are within the standard range can the baby grow up healthily. However, many parents are not so familiar with the baby's height and weight standards. Therefore, if you are a family with a baby, you should know the baby's height and weight before birth.

Babies' height and weight standards will be related to their birth weight and birth height. From the baby's weight, a healthy full-term baby will generally be between 2.5 and 4 kilograms. 1-6 months, the baby's weight is generally (birth weight+month age x0.7 1) kg, 7- 12 months. The baby's weight is generally (birth weight+month age x0.5) kg. When the baby is 2- 10 years old, the weight is generally around (age x2+7) kg. As long as the child's weight is not lower than or higher than 10% of the standard weight, it can be regarded as normal.

In terms of baby height, if it is a healthy full-term baby, the birth height is generally about 50 cm, and the baby grows faster in the first year, generally at a speed of 25 cm. Therefore, when the baby is 1 year old, the height should be about x5+75 cm. After one year old, babies generally grow at a rate of 5 cm per year. So when the baby is 2- 10 years old,

According to the above method, if a 3-year-old child is a child, his height should be between 8 1-99 cm and his weight should be between11.7-14.3 kg. If it is above or below this range, parents should pay attention. If possible, parents can take their children to a regular hospital for examination.