US District Judge David Briones recommended that Mr Tappin should be allowed to serve his sentence in the UK but the decision ultimately rests with the US Bureau of Prisons, a spokeswoman for the court added.
He will commence his sentence at the Allenwood prison in Pennsylvania and must turn himself in to start the term by March 8.
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The condition was revealed by a nine-week scan, which showed the baby's heart and part of her stomach growing outside the body.
The scan of the object will begin on Wednesday, with astronomers using four different radio frequency bands. It will last around 10 hours.