Similar in vein to the other Captain Underpants books in terms of humour, content and storyline. The series of books revolve around the two main rather naughty boy characters invented comic book hero 'Captain Underpants' and the odd occasions where their imagination merges with reality. Although George and Harold aren't the best behaved young men, they do redeem themselves by saving the world on numerous occasions. The stories aren't anywhere near as puerile as the titles suggest, although they are accurate descriptions of the key plot elements. This book has far less 'real' action though as the whole book is the two boy's comic of Super Diaper Baby's adventures (for reasons explained in the storyline).
Most of the pages are therefore the roughly drawn illustrations imitating an American primary schoolboy's attempt to draw a complete comic, bad spelling and all. Still very fun though and recommended. Actually, despite Amazon's listing initially suggesting otherwise, 'Diaper Baby' isn't Capt. Underpant's son (as if it matters). Highly recommended for any preteen boys, aged between 7 and 10. It should be read after the first five Capt Underpants books though - which are now available as a cheap boxed collection or unboxed 10 book set.
Very sensitive adults might find this books potty humour plotline a tiny bit gross though, as it's a little bit more graphic than a 'normal' Capt Underpants book. The only other minor downside is the odd spelling for those practising their reading, as it's US American with preteen schoolboy phonetic in the 'comics'. I read the books to my 9 year old dyslexic son, so this is less of a problem for us.