There are three types of growth charts: head circumference, waist circumference and body mass index, states Healthline. The charts help to observe weight management and weight loss as well as track how a child grows and develops.
A head circumference growth chart measures the widest part of the head in children who are less than 36 months old, explains Healthline. A head that is abnormally big may indicate fluid retention in the brain, while an extremely small head may signal poor brain development. The waist circumference of men and women who are not pregnant should be at most 40 inches and 35 inches respectively.
A body mass index of 18.5 and below indicates that an individual is underweight, while an index of more than 30 shows that a person is obese, states Healthline. A range of 18.5 to 24.9 indicates a healthy weight. A person with a body mass index that ranges between 25.0 and 29.9 is overweight.