A crib the same as a rollaway bed is only a request. After more than two decades in the industry with Marriott and Hilton, I've seen far too many guests lose their minds at check in that just because they made a request on their reservation somehow they take that to mean it's guaranteed. Believe me, it's not. If you want to be sure, always call the property ideally during the day and politely ask if they have cribs (or what they usually are which is a Graco-esque Pack and Play) and if your reservation can be noted with the request. Then call back day of arrival and follow up. It's a bit of legwork but it's the only way to be certain. Most select service properties have two or three at most and especially in summer on weekends they go quick. The idea that the hotel should have a limitless supply is not realistic or that they'll go out an buy one just because of a request is also not realistic the same as the idea that someone can check in anytime and expect without prior warning potentially the only person on property to leave the desk and find a crib is also not realistic especially with the current pandemic staffing models in place. Plan ahead and do the legwork.