What (child) book is this line from?

[cliffdiver]

Or similar.

'And he grew and he grew into something he knew.'

It's really bugging DD2 and I.

I think it may be a Julia Donaldson book.

Hmmm we read a lot of Juli Donaldson and I don't recognise this line. I'm curious too now!

Now it’s bugging me! Super Worm?

No, Shark in the Datk!

Thank you @stclair that's it!

The very hungry Caterpillar