Originally Posted by Cat Herder:
That is why I use porta-crib mattresses for all and buy 12 sheets/fleece blankets at a time (6 kids). 
Standardization makes it easier to clean and nothing from home limits disease transmission. 
When they outgrow their crib, they use their mattress as a nap mat. New baby/new mattress.
After nap is over I change everything out for the next day then toss in the laundry. Easy/Peasy
I use cots started at around 18 months. I’ll end up making sure I have 5 sheets per infant. I’m just not okay with non-evidence based changes like these.