system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do babies have to sleep so much more than adults? And why can’t they get all that sleep in one go each day, rather than over multiple naps?
gpt
Once born babies will do one thing for the first months: Grow more.

Their stomach is the size of a marble, that is how much they can eat in one setting. After that more sleep because that is energywise the cheapest way: All energy not used for activities can be used for growing.

Once their stomach is empty they want it to be filled up again and the cycle repeats.

So multiple naps because their stomach is smaller, so much to conserve energy so it can be used for growing.

PS After about three months of this and when the parents go from "Will this ever change????", the baby will smile and the parent's heart will melt.