Ditto to the above. A 2.5 year old is happy playing and you can easily teach numbers and letters and colours and shapes while playing with him. I accept 10 month old babies into care too and have a large age range in my daycare right now, but I start the babies painting when they are right around a year old and colouring with washable markers and playing with playdo and gluing crafts. Keep your crafts super simple. I have done simple things like a 'hard and soft' craft, gluing feathers, cotton balls, acorn tops, etc. onto a piece of construction paper.

I make one meal for all the children and just cut the pieces smaller for the babies. Don't work too hard by making tons of food. No matter what the age of the child in my daycare they all sleep from 1-3pm (sometimes a little earlier and a little longer) but they are all on the same schedule. As far as toilet training, don't try to do all the work, make sure the parents have gotten it well on the road because you are helping them with this but it is not your total responsibility.