system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is it we suffer no physical consequences, like cramping or atrophy, as a result of being stuck in the same position (fetal position) for 9 months in the womb?
gpt
The fetus is moving and growing. It is called quickening. Lots of fidgeting, punching, and kicking. When first born, human babies cannot hold up the weight of their head or sit up. They flop down. Every single action is basically exercise or sleep for them. They start losing weight from all the "activity" and are basically as all systems geared toward bulking.