A woman who has been mistakenly impregnated with the wrong IVF embryo will hand over the baby when she gives birth.

Carolyn and Sean Savage of Ohio in the US are due to have the baby boy in two weeks.

In February, Carolyn, 40, was impregnated with what she believed to be the remaining embryos but two months into the pregnancy doctors told her they were the wrong ones.

The couple decided not to terminate the pregnancy because of religious reasons but to give the baby to the biological parents.

"It has been hard, we have been rooting for the baby the whole time," Carolyn told NBC's Today Show.

She said she dreads the moment she has to hand the baby over but feels it is the right decision.

"They delivered the worst news of our life," Sean said.

"It’ll be exceptionally difficult."

The Savages have three other children.