The weight and height of babies are affected by various factors to a certain extent, and there are certain differences between different age groups and genders.
1. The average weight of a normal full-term baby is about 3.25kg at birth, and the weight can increase by 1-1.7kg in the first month, about twice as much as at birth in the first 3-4 months after birth, and about three times as much as at birth in the first 12 months of life. the formula for calculating the weight of a baby in the period of 3-12 months is: [age (month) + 9]/2kg, that of a baby in the period of 1-6 years of age is: age (year) x 2 + 8kg, that of a baby in the period of 7-12 years of age is: [age (year) x 7-5]/2kg, and that of a baby in the period of 7-12 years of age is: [age (year) x 7-5]/2kg. The formula for calculating weight at 12 years old is: [age (years) x 7-5]/2kg.
2. The average length of a baby at birth is 50cm, the fastest growth in the first year of life is about 25cm, of which the growth in the first 3 months is about 11-13cm, the length of a baby at the age of 1 year is about 75cm, the growth in the second year slows down to about 10-12cm, the length of a baby at the age of 2 years is about 87cm, and the growth every year after the age of 2 years is about 6-7cm, and the formula for calculating the height of a baby at the age of 2-6 years is: age (age) x 7 +75cm, 7-10 years old height calculation formula is: age (years) × 6 +80cm.
It is worth noting that the baby’s weight and height increase at a non-equal rate, and is related to many factors such as feeding, nutrition, sleep, exercise, etc. When in doubt about your baby’s height and weight, you should go to the hospital and consult your doctor for a more comprehensive understanding of your baby’s growth and development.