Is Katie Holmes having trouble accepting Tom Cruise's sperm?

Maybe if they prayed harder to the almighty alien Scientology God.........
Entertainmentwise:
Tom Cruise and Katie Holmes are reportedly seeking medical advice in a bid to give daughter Suri a little brother or sister.
The couple are said to be so desperate to extend their family - which already includes 20-month-old Suri and Tom's adopted children, Connor and Isabella, with his ex-wife Nicole Kidman -that they plan consult a fertiity specialist.
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."
The couple are allegedly planning to visit Los Angeles' Cedars-Sinai Medical Center later this month for a consultation, according to Britain's Now magazine.
The couple have made no secret of their desire for more children.
Katie has 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."