What does "gaining fetal growth without gaining body weight" mean?

Having the baby grow without excessive weight gain in the mother is an ideal condition during pregnancy, meaning the fetus develops normally within the uterus with all indicators on track, while the mother's weight remains within a reasonable range, avoiding excess fat accumulation. This state should be achieved through scientific nutrition and moderate exercise, rather than complete weight stagnation. Detailed explanation is as follows:

Pregnancy-related weight gain includes essential components such as the fetus, placenta, and amniotic fluid, as well as appropriate increases in maternal tissues. The key to "growing the baby without growing excess body fat" lies in minimizing unnecessary fat accumulation by directing nutritional intake primarily toward fetal development. Pregnant women achieving this typically maintain a balanced diet rich in high-quality protein, complex carbohydrates, and dietary fiber, while avoiding high-sugar and high-fat foods—thus meeting the fetus’s developmental needs without causing excessive maternal fat storage. It is important to note that this does not mean halting weight gain altogether; during the second and third trimesters, a steady and appropriate weekly weight increase is still necessary. If a pregnant woman shows no weight gain over an extended period, it may lead to insufficient fetal nutrition and impaired growth.

Achieving this optimal state requires a personalized plan. Under medical guidance, expectant mothers can adjust their diets to ensure comprehensive nutrition. Engaging in gentle exercises such as walking or prenatal yoga also helps enhance metabolism. Regular prenatal check-ups are essential to monitor both maternal and fetal health, allowing for flexible adjustments to diet and exercise plans according to the stage of fetal development.