Question

Weight gain in pregnancy is related to all of the following except?

• A. Ethnicity
• B. Smoking
• C. Socioeconomic status
• D. Pre-conceptional weight

Hint:

One option mainly cuts the baby's birth weight, not the mother's gain.

Answer 1

The Correct Option is B

Frame this as which variable is built into the way obstetricians plan and predict maternal weight gain. Pre-conceptional weight is the anchor, because the Institute of Medicine targets for total gain are written separately for underweight, normal, overweight and obese mothers, so the starting weight directly sets the expected gain. Socioeconomic status feeds in through diet quality, food security and antenatal care, all of which shape how much weight a mother accrues. Ethnic background is linked with characteristic differences in body composition and average gestational gain across populations. Smoking sits apart from this group; its dominant obstetric footprint is on the fetus, causing growth restriction and lower birth weight through chronic placental hypoxia, rather than being one of the listed maternal determinants of how much the mother gains. So, by this exam's reasoning, smoking is the factor that does not belong with the others.

\[\boxed{\text{Smoking}}\]