Moira and I were reading and these are the first three books she chose:
We're Going On A Bear Hunt
Lost (a bear gets lost in New York, and a little boy helps him get home by bus)
The Wheels On The Bus
Then she ruined it by bringing Oh My Oh My Oh Dinosaurs, which isn't related in any way. Although she may just have switched themes because the book after that was also by Sandra Boynton.