We're switching day cares at the end of the month. DD has been in the same room for almost 5 months now. The main teacher has only been there for 1-1 1/2 months but the assistant has been there the entire time. She's also there every morning when I drop DD off. Is a goodbye gift appropriate and, if so, what? Is it bad if it's only for the assistant? And what about the kids - DD has been with the bulk of them since she started there a year ago. I see some of the parents on occasion. Do I bring a treat, leave goodbye notes, etc.?