Weight: - The newborn loses upto 10% of its weight during first week but regains it in the next few days. The child doubles its birth weight by 4-5 months and trebles it by 1 year of age. The weight is quadruple to the birth weight by 2 years of age.
To estimate normal weight of the child, the following formula may be used:-

Age	Weight
At birth	2.5 - 3.75 kg.
3-12 months	(Age in months) + 9 / 2
1 to 6 years	(2 x Age in years) + 8
7 to 12 years	(7 x Age in years) + 5 / 2