Prince William struggled to stay awake during a service at Westminster Abbey - and it suggests his new baby is keeping him up

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• Prince William appeared to be struggling to stay awake during a service at Westminster Abbey on Wednesday.
• He was back to royal duties just two days after his third child - a baby boy - was born.
• Despite his sleepy appearance, he reportedly managed to joke with attendees about the heavily anticipated announcement of the new royal's name.

The Duke of Cambridge appeared to be struggling to stay awake during a service at Westminster Abbey on Wednesday, just two days after his third child was born - and it suggests the new royal might be keeping him up.

His wife, the Duchess of Cambridge, gave birth to a baby boy weighing 8lbs, 7oz at 11.01 a.m. on Monday April 23 at the Lindo Wing of St Mary's Hospital in London.

Two days later Prince William attended an Anzac Day service to honour New Zealand and Australia's war dead at Westminster Abbey along with his brother Prince Harry and Meghan Markle.

But he looked pretty sleepy throughout the service.

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His brow was furrowed at times, and he appeared to be battling against heavy eyelids.

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At some points he even looked like he was stifling a yawn.

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Despite his tired appearance, Prince William confirmed that Kate and the baby are "very well thanks," according to the Daily Mail. He added that they are "in good form, luckily. Sleeping's going reasonably well so far, so he's behaving himself which is good news."

He even managed to joke about the anticipation building arond the announcement of the baby's name. Sir Jerry Mateparae, New Zealand High Commissioner to the UK, reportedly said to the Duke: "Jerry would like it to be Jerry."

"Jerry's a strong name," the Prince replied.

You can see the drowsy-looking Prince William during the service in the video below: