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Published 15:00 14 Jan 2015 GMT
Updated 18:42 14 Jan 2015 GMT

The pair were inundated with comments from well wishers and gamely answered some questions from curious readers:
Responding to a Reddit user who wondered how the couple decided which of them would carry the baby, MeggoEgggo1 added: “Well my wife dated men before me so she always thought she'd be pregnant. I wanted nothing to do with it. So it worked out.”
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