Britain's Prince William and his wife Catherine, Duchess of Cambridge, arrive with their son Prince George and daughter Princess Charlotte for Princess Charlotte's christening at the Church of St. Mary Magdalene in Sandringham, Britain July 5, 2015.
Britain's Prince William and his wife Catherine, Duchess of Cambridge, arrive with their son Prince George and daughter Princess Charlotte for Princess Charlotte's christening at the Church of St. Mary Magdalene in Sandringham, Britain July 5, 2015. Reuters/Chris Jackson

It’s only been days since the Duke and Duchess of Cambridge had their second child baptised. Princess Charlotte Elizabeth Diana was recently christened on July 5, yet punters are already betting on when their third child could be due.

Punters from British bookmaking firm Coral have their eyes set on the year 2016 for Kate Middleton’s third child to arrive, having the odds of 6-4. According to Red Book magazine, there is a 40 percent chance that the Duchess of Cambridge could get pregnant again when she reaches the age of 33 next year.

According to Yahoo Parenting, it would also be wise for the duchess to have her third child before she reaches her mid-30s. The chances of having a healthy baby reportedly become slim when a woman reaches past the age of 35 to conceive.

“Studies show that by about age 37, the odds of having a baby with a chromosomal disorder do go up, but the jump becomes steeper after age 40,” Dr. Deborah Gilboa, parenting and youth development expert, told Yahoo Parenting.

Coral also had punters who gambled on Kate Middleton’s third child to arrive sometime in the year 2017, with the odds at 2-1. Dr. Gilboa explained the benefits on having to space a pregnancy out every two years.

“For a mother’s health, the optimal amount of time between pregnancies is considered to be at least a year, so the babies are two years apart — giving her body time to restore her pelvic muscles and levels of nutrients such as calcium and iron, which are depleted during pregnancy,” she said.

Sources close to the Duke and Duchess of Cambridge also believe that the couple will not stop with two children. Among these sources include Indi Hicks, cousin of Prince Charles. He told People in an exclusive interview that Prince William and Kate Middleton can actually stop with two children especially since they both now have a boy and a girl. But he suspected that they still “won’t stop there.”

According to Mirror UK, even Kate Middleton’s uncle, Harry Goldsmith, believes the couple will opt for a bigger family. He reportedly told The Sun that Kate and William will not “stop at two.”

To report problems or leave feedback on this article, email: t.diente@IBTimes.com.au.