My Sister's a Burp by Gretel Killeen
Fourth book in the series about Zeke and Eppie's madcap adventures. When the teeny-weeny Zeke and Eppie are accidentally swallowed by their mum, it's the start of a chuckle-choc-a-block adventure full of bubbling brains, evil eyes, bouncing bottoms, hysterical hair and ticklish teeth and that's all before Mum realises that Zeke and Eppie are even missing. Can Zeke and Eppie save Mum's life, and their own, or is this the end? This slapstick adventure, bursting with anarchic energy has enormous child-appeal even for the most reluctant reader.