Keith Vaz has urged the Government to quickly change the law of royal succession following the announcement that the Duke and Duchess of Cambridge are expecting a baby.
The Leicester East MP has submitted an early day motion calling for the law to be changed before the birth of the royal baby
It follows his Private Member's Bill to Parliament in January last year calling for the eldest child of a ruling monarch to succeed them to the throne, regardless of gender.
Under current law which the throne passes to the first-born male heir even if he has elder sisters.
Though the Mr Vaz's bill made it through the early stages of parliamentary process it was dropped as it had not become a fully-fledged law by the end of the parliamentary session.
Leaders of Commonwealth countries unanimously voted for the change in October last year.
And in May the Queen's speech outlined the intention to reform the law of succession which dates from the 17th century.
The sex of the child is not yet known.
Mr Vaz's motion has so far been signed by one other MP - Bob Russell, the Liberal Democrat MP for Colchester.
