Don't you cover the schedule at the interview? I'm willing to let a new baby nap for a short time in the morning when they start if they are very young and learn to stay awake all morning until our naptime. However, I nudge naps up from 1-3 to 12-2ish when necessary. As I'm waiting for the new baby to start for a week or so I'll get the established children into bed maybe 10 minutes earlier every day until we meet in the middle. But it's a compromise with the new family and I'll eventually get them back to a later naptime as the new baby grows comfortable.

I find the new baby will drop their morning nap soon because our mornings are so very active and it keeps them occupied but they can't stay away much past lunchtime, so I make that earlier for a while, close to 11am.

Experiment a bit, talk to the parents but make them understand that THEY are fitting into a schedule with 4 other children who are already into a great routine and it is THEIR responsibility to make a few changes too so their child will be healthy and happy at daycare.

I agree with DisneyP, why do parents want to saboutage their child's health and happiness instead of helping them adjust? Why do they fight us when we are here working hard to make sure all the children are taken care of properly? We're not doing it for US! We're trying to be happy as well, but one screaming baby will ruin it for us and for the other children in the daycare. Ugh!

If the parents are putting their foot down as you say, then they should have a nanny.