Which method of measuring weight involves comparing a persons weight and height

The answer is BMI. This index has ranges that help indicate whether one is underweight, normal weight, overweight or obese. To calculate BMI, the following formulae are used;

Weight (kg)/height (m) ^ 2

To check your BMI Categories:

Underweight = <18.5

Normal weight = 18.5–24.9

Overweight = 25–29.9

Obesity = BMI of 30 or greater

it's a nutrition food for pregnant mothers so they unborn child can get its nutrition that it needs to grow in to a healthy baby.

explanation:

and the mother is getting all of her nutrition and her calcium and vitamins .