Final answer:
The recommended weight gain during pregnancy in the United States is 25-35 pounds. This accounts for the weight of the developing fetus, the enlarged uterus, and other physiological changes. Only about 300 extra calories per day are necessary during the second and third trimesters. The correct answer is b) 20-25 pounds.
Step-by-step explanation:
The current recommended weight gain during a pregnancy in the United States is 25-35 pounds (c). During pregnancy, appropriate weight gain is crucial for the health of the mother and the developing fetus. The first trimester typically does not require additional caloric intake, and a weight gain of around 1 pound per month is common. As the pregnancy progresses into the second and third trimesters, only an additional 300 calories per day are necessary to support the growing fetus, which corresponds to roughly 1 pound per week of weight gain.
This includes the weight of the fetus, enlarged uterus, amniotic fluid, placenta, additional breast tissue, increased blood volume, and some fat storage for breastfeeding. Excessive weight gain may lead to health risks for both the mother and baby, including gestational diabetes and future obesity. Therefore, the correct answer is b) 20-25 pounds.