胎儿和母体的变化胎儿:胎动开始进入这一时期,胎儿迅速变大,胎毛开始遍布全身,头发、手指甲和脚指甲也开始了生长。眼睛和耳朵等器官的形成接近完成。胎儿心脏的活动开始变得活跃。在这一时期末,通过产科专用听诊器可以直接听到心脏的声音(胎儿的心音)。由于羊水量的增加,胎儿可以在其中自由活动,手脚的活动也变得更为活跃隐约已能触到子宫壁。这一时期,胎儿的 Fetal and maternal changes Fetus: Fetal movement begins to enter this period, the fetus rapidly becomes larger, the furred hair begins to spread throughout the body, and hair, fingernails and toenails also begin to grow. The formation of organs such as eyes and ears is almost completed. Fetal heart activity begins to become active. At the end of this period, the heart sounds (fetal heart sounds) can be heard directly through the maternity-specific stethoscope. As the amount of amniotic fluid increases, the fetus can freely move in which hands and feet activities have become more active and can already touch the uterine wall. This period, the fetus