If you've been following the pics and footage of Prince Harry and mum-to-be Meghan Markle on their recent Royal tour, you might have been wondering just what is going on with her baby bump...
There is no denying that in some images there's no doubt at all that a Baby Sussex is well and truly on its way, but in others Megs is her usual slender self.
We don't know exactly how far along Meghan is, although as most parents choose to announce a pregnancy after their twelve-week scan, and the Palace having said the baby is due in the spring, we would guesstimate around the four-month mark.
And that is pretty early for a bump to be - occasionally - looking quite so out there!
While of course it can all come down to outfit choices (don't we all have a dress that makes us look six months gone?), posture, and even what the Royal party had for lunch (no, not pregnant, just pasta), there are actually proper medical reasons why a mum-to-be might change shape throughout the day.
At night time, your abdominal muscles are tired from holding your bump.
According to the Sun on Sunday, Meghan's bump could be more prominent in the evening due to her muscles being tired of holding the baby in all day.
They cite birth expert Susannah Birch who said a slackening around the tum as the day progresses could make a bump look larger.
And a quick squizz at the pics of the Royal tour does indeed prove that Meghan is deffo looking more preggers by night.
"At night time, your abdominal muscles are tired from holding your bump [and they] loosen as they grow more tired, which allows your bump to sit out further and appear larger," she said.
However, another pregnancy pro waded in with a different opinion – blaming common-or-garden bloating and the hormone progesterone for Meghan's evening increase.
The paper quoted Melbourne-based gynaecologist Dr Joseph Sgroi who revealed "a lot of women will say that towards the end of the night they do feel a lot more bloated".
Dr Sgroi said this was due to both what they had eaten, and because progesterone, which is secreted from the placenta during pregnancy, slows the gut down, meaning that the food hangs around for longer.
So there we have it - Meghan's mysterious shape-shifting is either down to bloating or tired muscles.
Not that that explanation will going to stop us scrutinising the Royal bump at every opportunity, right?
Did you have an ever changing early pregnancy bump? Leave us a comment on our Facebook page @EntertainmentDailyFix and let us know what you think.