By Elizabeth Cohen (CNN) Will Catherine give birth to a boy or a girl?
A Prince or Princess?
Londoners love to guess...
"What do you think- boy or girl?"
"It's gotta be a girl."
"I think she would have a boy."
"A girl. It looks like a very elegant feminine bump, so."
(Reporter): "So most people think pretty much just 50-50 chance whether you will have a boy or a girl totally random."
(Reporter): "But, apparently, that's not true."
"No. Absolutely it's not true."
BIOLOGIST FIONA MATHEWS IS AN EXPERT ON THE SCIENCE OF SEX PREDICTION.
SHE SAYS THERE'S REAL EVIDENCE THAT THE ROYAL COUPLE IS LIKELY TO HAVE... A DAUGHTER!
FIRST, THERE'S CATHERINE'S TINY PRE-PREGNANCY WAISTLINE.
MATHEWS' OWN STUDY SHOWS WOMEN WHO EAT LESS ARE MORE LIKELY TO CONCEIVE A GIRL.
"One idea is that maybe boy babies or boy embryos need to have a much richer food supply."
THEN, THERE'S PRINCE WILLIAM'S DARING RESCUES AS A ROYAL AIR FORCE PILOT…
"It's emotional. It's physical. It's very demanding."
"High stress job, those men are more likely to have girl infants than boys."
AND PERHAPS MOST TELLING OF ALL:
"The duchess has been admitted to hospital. She is suffering from very severe morning sickness."
THAT MEANS SHE'S 80 PERCENT MORE LIKELY TO HAVE A GIRL, ACCORDING TO ONE STUDY...
"So, girl, girl."
"Are these all old wives' tales or is it real science? (No, this is all real science."
OF COURSE, IT MIGHT BE TOO SOON TO PAINT THE ROYAL NURSERY PINK JUST YET.
WE'LL FIND OUT THE BABY'S GENDER FOR SURE WHEN IT'S POSTED IN THE BUCKINGHAM PALACE COURTYARD... JUST LIKE WHEN PRINCE WILLIAM WAS BORN.
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