We’ve all got Bellybuttons! By David Martin, illustrated by Randy Cecil

From chapters.ca:
In David Martin's rollicking romp, playfully illustrated by Randy Cecil, little ones can follow the actions of animal babies and discover all the wonderful ways their bodies can move. Are you an inny or an outy? Either way, you'll love this perfect read- aloud! We've all got hands for clapping, necks for stretching, and feet for kicking. We've all got eyes that close and mouths that open (and often do). But best of all, as this colourful menagerie is happy to display, we've all got bellybuttons - for tickle- tickle- tickling!