3 under 2 yrs old.

It depends on the kids too, and how you transition them in. I currently have 3 under 2 and 1 that's almost 3. 3 of them come full time and one part time. So my worst day is 4. It's one too many for my taste. You need to transition them in one at a time. Get one comfy and then do it again with another one. I transitioned 2 one year olds in at the same time and never again! UGH!