Since the fetus is formed in its mother’s womb, calculating weight and height is one of the most important things that both the mother and the doctor care about, because of the importance of this matter in knowing the child’s growth rate and needs, and there are ways that enable the mother to calculate the normal rate of growth The child from birth until he reaches adolescence and youth.

**Weight of the child immediately after birth until the completion of the first year**

the child weighs between 2.5 and 4.5 kg immediately after birth, and its length is 45.6 to 52.7 cm.

At the completion of the first month, it weighs between 3.2 and 5.4 kg and its length is between 50 and 57.4 cm.

By the end of the second month, it weighs 4 to 6.5 kg and is 53.2 to 60.9 cm long.

At the end of the third month, it weighs 4.6 to 7.4 kg and is 55.8 to 63.8 cm long.

At the end of the fourth month, it weighs 5.1-8.1 kg and reaches 58-66.2 cm in length.

At the end of the fifth month, it weighs 5.5-8.7 kg and reaches 59.9-68.2 cm in length.

At the end of the sixth month, it weighs between 5.8 – 9.2 kg and reaches 61.5 – 70 cm in length.

At the end of the seventh month, it weighs 6.1-9.6 kg and reaches 62.9-71.6 cm in length.

At the end of the eighth month, it weighs 6.3 to 9.6 kg and is 64.3-73.2 cm long.

At the end of the ninth month, it weighs 6.6-10.4 kg and is 65.6-74.7 cm long.

At the end of the tenth month, it weighs 6.8-10.7 kg and is 66.8-76.1 cm long.

At the end of the eleventh month, it weighs 8.6-11 kg and reaches 68.0-77.5 cm in length.

At the end of the first year, the child weighs 10.1-12.3 kg and the length of the child is between 69.2 – 78.9 cm.

These rates vary depending on the condition of the child and the nature of his nutrition, but the constant here is that when the child reaches the age of two years, his weight must reach four times his weight at birth.

**The method of calculating the child’s weight and height
**

**Calculating the child’s weight after two years**

To calculate the correct child’s weight, a simple equation must be followed through which you can find out if the child’s weight is normal, less or more than normal.

The formula for calculating the weight is (the child’s age in years * 2) + 8 = the ideal weight for the child in kilograms.

For example, if the child whose weight is to be known is two years old, the equation will be 2 * 2 = 4 + 8 = 12 kg, which is the ideal weight for a two-year-old child.

**Calculate the ideal child’s height,**

and here you make another equation, which is (the child’s age in years * 5) + 80 = the child’s height in cm.

For example, if the child is three years old (3 * 5) + 80 = 95 cm, which is the ideal height for a three-year-old child, knowing that this height may vary depending on genetic factors.

**The weight and height of children from two years to 18 years**

– for girls, the ideal weight for two-year-olds is 12.25 kg and the ideal height is 86.36 cm, as for boys, the weight is 12.4 kg and the height is 86.36 cm.

Four-year-old girls weighed 15.4 kg and were 101.6 cm tall, while boys weighed 16.3 kg and were 101.6 cm tall.

Six-year-old girls weighed 20.9 kg and were 114.3 cm tall, while boys weighed 20.9 kg and were 114.3 cm tall.

Eight-year-old girls weighed 26.3 kg and were 127 cm tall, while boys weighed 25.4 kg and were 127 cm tall.

The weight of ten-year-old girls is 32.7 kg and the height is 137.15 cm, while the boys are 31.8 kg and the height is 139.7 cm.

The weight of twelve-year-old girls is 41.7 kg and height is 149.86 cm, while boys weigh 31.8 kg and height is 139.7 cm.

The weight of fourteen-year-old girls is 49.4 kg and height is 160 cm, while boys weigh 50.8 kg and height is 162.56 cm.

Sixteen-year-old girls weighed 54 kg and were 162.6 cm tall, while boys weighed 60.8 kg and were 172.72 cm tall.

Eighteen-year-old girls weighed 56 kg and were 165 cm tall, while boys weighed 72.6 kg and were 177.26 cm tall.

**The weight of an adult from 18 years of age
**onwards, and one of the easiest ways to calculate the ideal weight for a person is by decreasing 100 from his height. For example, if a person is 170 in height, the ideal weight for him is 170 – 100 = 70 kg. This method is one of the easiest and most accurate methods, and there are many other methods that allow us to calculate body mass , but it is relatively complicated compared to this method.