Four oversized nappy-wearing toddlers have paraded around London in a royal baby stunt.

The kids, sporting hand-crafted silicon masks, were shouting Paddy Power betting odds related to Prince William and Kate's unborn child.

They went on the London Underground and visited Buckingham Palace, Boujis Nightclub and St Mary's Hospital.

A Paddy Power spokesperson stated: "According to our patriotic punters, we could soon be welcoming Princess Alexandra or Prince George, born on the 17th of July with brown hair weighing in at 7lbs.

"They say the best things come to those who wait, and anyone taking up our 500/1 accumulator could be next in line for a right royal payout should their hunch come good."

More than 2,000 bets have been placed on Paddy Power's 'Hair Colour' market, with the odds on a brunette baby being 6/4.

Meanwhile, the odds on a black-haired child is currently at 2/1, with blonde at 7/2 and ginger at 7/1.

The 'Hair Colour' market was referenced in the royal baby stunt with each giant toddler having different coloured hair.

Last month, it was reported that Prince William and Kate do not know the sex of their baby.

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