Ewan McVicar in his book "Doh Ray Me, When Ah Wis Wee" has it written as follows:

Mrs Maclean had a wee wean
She didny know how tae nurse it
She gied it tae me, ah gied it some tea
And its bonny wee belly burstit.

Thanks and Acknowledgements

Many thanks to Alexander McFarlane from Glasgow for sharing this rhyme!

Thank you!