If your BMI is 30 or above, your risk is doubled from 7 in 100 to 14 in 100 compared with women with a BMI of between 20 and 30. Women must build up a variety of tissues that will support the nourishment of the fetus, and they include the fetus, the placenta, amniotic fluid, uterus, blood, and fat. BMI (body mass index) calculation is a simple way to find out whether you are a healthy weight for your height.
Women who are underweight pre-pregnancy have been suggested to have a higher risk of preterm delivery, small for gestational age (SGA) and low birthweight (LBW) 1, 2. It's not just the baby that weighs you down in those later months. Most of the weight gained in pregnancy goes into the development of tissues that allow fetal development, growth, and breastfeeding. Maternal pre-pregnancy BMI is known to influence pregnancy and birth outcomes.
The SBMI – an index that has been developed four years ago especially for this calculator – serves for this purpose. 19.2 Assessing BMI 19.2.1 Measuring height and weight and calculating BMI. Start by considering these guidelines for pregnancy weight gain and obesity: Single pregnancy. Achieving and maintaining a healthy weight. This calculator computes the body mass index and rates it appropriately for men, women, children, juveniles and seniors.