Betting house Ladbrokes is offering odds on all things related to Prince William and Kate Middleton's second child.
Some of the bizarre betting odds being offered include on the hair colour of the newborn, The Mirror reported.
Odds of 6/4 are being offered for blonde and brown hair colour with odds of 5/1 for black and red.
Bets are also up for grabs on the weight of the newborn with less than 6 pounds having odds of 10/1 and 6 pounds to 15 ounce at 6/1.
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Meanwhile, odds of princess have been slashed by Ladbrokes.
On the last day of April more than 5,000 pounds was wagered with the firm that a little girl will soon be welcomed into the world, and the weight of the money has forced the odds to be cut into just 4/9, leaving the chance of Prince George being joined by a brother to drift out to its biggest price yet of 13/8.
It is now an 8/1 shot the latest member of the Royal Family arrives on polling day -- May 7.
Jessica Bridge of Ladbrokes said: "Obviously the gender's a 50:50 shot, but not as far as the money's concerned. Punters betting with their heart are backing a girl, whereas savvy punters betting with their head reckon it's a boy."
"There's a sense of deja vu in the air as the odds favoured a girl back in 2013 and time will tell if it's second time lucky for Princess backers," she said.