What factors combined contribute to the overall weight gain during pregnancy?

The most comprehensive understanding of overall weight gain during pregnancy involves several key components, which is why the correct choice includes baby, amniotic fluid, placenta, uterine growth, and blood volume.

During pregnancy, the body undergoes numerous changes to support the developing fetus. The weight of the baby itself naturally contributes to the total weight gain, while the amniotic fluid surrounds and protects the baby, adding to the weight as well. Additionally, as the placenta, which provides nutrients and oxygen to the fetus, forms and grows, it contributes a significant amount of weight.

Uterine growth is another crucial factor; as the uterus expands to accommodate the growing baby, it adds to the overall maternal weight. Finally, increases in blood volume are essential as they support the metabolic needs of both the mother and fetus, further contributing to weight gain.

This combination of factors paints a holistic picture of the physiological changes occurring throughout pregnancy that are responsible for the overall weight gain. Other options may mention aspects of this process but do not encompass the full range of contributors as thoroughly as the correct choice does.