How much weight is gained during pregnancy?

Appeared in: BSF Staff Nurse - 2021

Explanation

The average weight gain during pregnancy for a woman with a normal pre-pregnancy BMI is approximately 11-13 kg.
This weight gain is essential for the healthy development of the fetus and to prepare the mother's body for childbirth and lactation.
Among the given options, 11 kg is the most accurate and commonly cited average for a healthy, full-term pregnancy.
The weight is distributed among the fetus, placenta, amniotic fluid, increased maternal blood volume, uterine and breast tissue growth, and maternal fat stores.

Option A: A weight gain of 1 kg is significantly insufficient for a healthy pregnancy. This amount barely covers the growth of the uterus itself and would indicate severe maternal malnutrition or a serious health complication.
Option B: A weight gain of 8 kg is below the recommended average for a woman starting with a normal BMI. This amount is more appropriate for a woman who is in the overweight category before becoming pregnant.
Option C: While closer to the target, 9 kg is still at the lower limit or below the recommended average for a normal BMI pregnancy. It falls within the acceptable range for women who are overweight or obese.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Physiological weight gain during pregnancy as background academic context rather than a clinical decision trigger.
Monitoring weight gain is a key component of antenatal care to assess fetal growth and maternal well-being.
Inadequate weight gain is associated with risks like low birth weight (LBW) and intrauterine growth restriction (IUGR), while excessive weight gain increases the risk of fetal macrosomia, cesarean delivery, and maternal postpartum weight retention.
What if? If a woman is pregnant with twins, the recommended weight gain increases significantly to about 17-25 kg for a normal BMI to support the growth of both fetuses and associated tissues.

How to Approach the Question

Identify the core question, which asks for a specific physiological value: the average weight gain during pregnancy.
Recall the standard physiological data for a normal pregnancy. The average is approximately 11-13 kg for a woman with a normal pre-pregnancy BMI.
Scan the options to find the value that best matches this recalled average.
Eliminate options that are clearly too low (1 kg) or fall into recommended ranges for different BMI categories (8 kg, 9 kg) rather than the general average for a normal BMI.

Concept Tested & Keywords

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E6 Nutrition Kumud Khanna 2e p. 80-82

E6 Physiology Guyton 4SAE Part 3 p. 61-63

E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 20-22

Practise the full BSF Staff Nurse - 2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.