Growth involves length and weight of the body, and includes internal growth and development. A child's brain grows the most during the first five years of life, reaching 90 percent of its final size. Growth also affects different parts of the body at different rates; the head almost reaches its entire size by age 1. Throughout childhood, a child's body becomes more proportional. Growth is complete between the ages of 16 and 18, when the growing ends of bones fuse.

Pediatricians use a range to describe normal growth for a child. The following are some average ranges of weight and height, based on growth charts developed by the Centers for Disease Control and Prevention (CDC):

Age Height
Females
in Inches 
Height
Males
in Inches
Weight 
Females
in Pounds
Weight 
Males
in Pounds
1 27 to 31 28 to 32 15 to 20 17 to 21
2 31.5 to 36 32 to 37 22 to 32 24 to 34
3 34.5 to 40 35.5 to 40.5 26 to 38 26 to 38
4 37 to 42.5 37.5 to 43 28 to 44 30 to 44
6 42 to 49 42 to 49 36 to 60 36 to 60
8 47 to 54 47 to 54 44 to 80 46 to 78
10 50 to 59 50.5 to 59 54 to 106 54 to 102
12 55 to 64 54 to 63.5 68 to 136 66 to 130
14 59 to 67.5 59 to 69.5 84 to 160 84 to 160
16 60 to 68 63 to 73 94 to 172 104 to 186
18 60 to 68.5 65 to 74 100 to 178 116 to 202

Although a child may be growing, their growth pattern may deviate from the normal. Ultimately, the child should grow to normal height by adulthood. If you suspect your child is not growing properly, consult your child's doctor.