Body Mass Index is the weight of an individual with respect to his height to determine the health conditions. It is calculated using the formula:
BMI = Weight (Kgs) / Height (m^2)
Following is the information on the BMI and it’s relation to weight/fat content in the individual.
Less than 18.5 --> Underweight
18.5 – 24.9 --> Normal
25 – 29.9 --> Overweight
Greater than 30 --> Obese

BMI affects the chances of getting pregnant to a great extent:
-- When underweight, a woman might undergo a condition called amenorrhea, which is total absence of menstrual cycles. This in turn affects the ovulation and pregnancy.
-- When overweight or obese, ovulation gets inhibited and thus the chances of conception reduce greatly. If in case conception happens, further impediments include – gestational diabetes, high blood pressure followed by organ dysfunction, labor problems, C-section, pregnancy loss and infections. The fetus could also be adversely affected exhibiting birth defects and chronic conditions.