Baby crying is insistent and constant, and the sound of it upsets you. But it's not loud. You only think it's loud.
Toddler crying is EEEEEEEEEEAAAAAHHHHHHHHHHHHHHHHH. And repeat. It is piercingly, nerve-shatteringly loud. And it can strike at any moment.
I get why parents will buy any toy, any candy, any enticing anything for their child just to make them please stop screaming. I hope not to ever do it. But I get it.