Tom Cruise and Katie Holmes having sex to have another baby?

Tom Cruise and Katie Holmes are reportedly struggling to conceive again.

The couple - who have a 20-month-old biological daughter Suri along with Tom’s adopted children, Connor, 12, and 14-year-old Isabella, with his ex-wife Nicole Kidman - are trying for a baby with no success and now allegedly plan to seek medical advice.

A source said: “Katie is so upset. They both really want another child but it just doesn’t seem to be happening. She says they have been trying since last summer. Tom and Katie have decided to go and see a specialist.”

Tom, 45, is reportedly desperate for another son so the couple are planning to visit Los Angeles’ Cedars-Sinai Medical Center later this month for a consultation, according to Britain’s Now magazine.

Last year, 29-year-old Katie revealed she couldn’t wait to fall pregnant again.

The ‘Batman Returns’ actress said: “Yes I definitely want more children. We're having the best time, it's so amazing. We have so many kids in our house, there's always this wonderful chatter and this great noise of kids. Tom is a great father so it came as no shock when we had Suri he was amazing with the baby."

Tom has also made no secret of his love of parenthood, recently saying: “I wanted to be a father all my life. It is truly amazing.”