<p>The couple welcomed baby Zachary over Christmas with the help of a surrogate mother and the Rocket Man revealed they both contributed sperm samples to the fertilisation process.<br /><br />They currently don't know which of them is the child's biological father, but John, 64, has said Zachary will have to undergo testing for his medical records, reported Contactmusic.<br /><br />"Zach will have to know for his medical records. If it's David, I'd be very proud. It wouldn't matter to me - and vice versa," John told talk show host Barbara Walters.</p>.<p>John also said their surrogate mother sent them breast milk via courier during their first four months after his birth.<br /><br />"The baby's been brought up in Los Angeles for the first four months so we've had the breast milk 'FedEx-ed' from where she (the surrogate mother) is to Los Angeles every day." </p>
<p>The couple welcomed baby Zachary over Christmas with the help of a surrogate mother and the Rocket Man revealed they both contributed sperm samples to the fertilisation process.<br /><br />They currently don't know which of them is the child's biological father, but John, 64, has said Zachary will have to undergo testing for his medical records, reported Contactmusic.<br /><br />"Zach will have to know for his medical records. If it's David, I'd be very proud. It wouldn't matter to me - and vice versa," John told talk show host Barbara Walters.</p>.<p>John also said their surrogate mother sent them breast milk via courier during their first four months after his birth.<br /><br />"The baby's been brought up in Los Angeles for the first four months so we've had the breast milk 'FedEx-ed' from where she (the surrogate mother) is to Los Angeles every day." </p>