M.M.
Hi!
We ski Whistler all the time and many of the Hotels have lists of Childcare companies (licensed and bonded) available. The childcare is exceptional and they have daytime and nighttime prices and guidelines. Many ski resorts have direct flights with "free" shuttle from the airport to the hotels. More and more places are accomodating young children. Once you have found a resort I'd ask around either here or other places on other parents experiences.
Expedia.com was fantastic for us the few times we used them. You don't have to "book a trip" thru them to get fantastic information. Great blunt feedpack/reviews on from normal folks on Hotels, Resorts and Transportation. Good Luck have a fantastic time!