The Duchess of Cambridge had to skip her son's first day of school due to a royal case of hyperemesis gravidarum.

I had the worst case of morning sickness during the first 14 or so weeks of pregnancy with my daughter. Luckily she was my first, and I was working from home at the time, so I was able to stay home and wallow in my misery without feeling a single stitch of guilt.

But Kate Middleton is not so lucky. The Duchess of Cambridge, currently preggers with Baby #3, is struggling with hyperemesis gravidarum—the severe nausea and dehydration that affected her first two pregnancies—and therefore had to take a pass on Prince George's first day of school this morning, according to a statement released by Kensington Palace.

Luckily, the Duke of Cambridge was able to step in as a pinch-hitter:

So sweet! We love how the adorable 4-year-old is holding his dad's hand along with that of the Head of Lower School, who happily led the royal duo into the classroom.

Also, can we take a moment to appreciate just how cute George looks in his Thomas's Battersea school uniform?

We are totally digging the whole navy-sweater-with-matching-shorts thing with coordinating tote bag!

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Poor Kate must have been pretty bummed to miss this charming rite of passage. I know I would have been! But HG is no joke—it is far worse than regular old morning sickness. The effects of dehydration can be both debilitating and dangerous—which makes self-care priority number one. So take it easy and feel better, mama!

And have a great first day, Little Prince!

Hollee Actman Becker is a freelance writer, blogger, and mom of two who writes about parenting and pop culture. Check out her website for more, and then follow her on Instagram