Babies are cute to their parents. I swear, it's an evolutionary thing to stop you doing stupid things to them. As Temporary_illusion, and any parent, knows they can cry and cry and cry. It does more than just unnerve you. It can drive you completely insane. It's at the point where you almost loose it that the 'cuteness' factor kicks in and stops you. Trust me, I know.
Our middle daughter was born with a Hiatus Hernia and spent the first year of life in considerable pain. She cried, a lot, even after doing all the normal things to calm them.
TI, it can be a lot worse. Plus your doll didn't want feeding every 3-4 hours then produce waste byproducts that need cleaning, at 3am, every night.
The worst time (other than all the time) is the 'Terrible Twos'. They start developing basic motor corrdination and some independance. Take a child with insatiable curiosity, is walking and learning everything at a phenomenal rate. Anything and everything they can get to is of interest. They copy everything you do. Try to stop then and tantrums ensue. Plus, if you try to help, they kick up a fuss with 'I'll do it' even if they can't.