Tubby by Leslie Patricelli

From chapters.ca:
It's time for a bath! Whee! And Baby obliges as only he can, playing with bubbles (and using them to make facial disguises from Santa's beard to bunny ears), imitating a motorboat, and letting Mommy wash his single hair. And what would tubby time be without running away naked and shiny clean - only to be scooped up and tickled? A beloved bedtime ritual takes on new joy in Leslie Patricelli's bright artwork, exuberant language, and simple, familiar scenes.