The Duke of Cambridge said although the moment he and his wife left the hospital with their newborn son was daunting, "We were happy to show him off to whoever wanted to see him".
Prince William said the last few weeks have been "a very different emotional experience" and "something I never thought I would feel myself."
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Tory Eurosceptic Jacob Rees-Mogg played down the significance of the deal struck by the Government to win over pro-EU rebels.
The Tanaiste issued the warning to the UK ahead of a visit to Dublin by European Commission President Jean-Claude Juncker.
Around 9,500 people gathered at the neolithic World Heritage Site to attend the overnight celebration of the longest day of the year.