A straight-talking mum-to-be has written a hilarious letter to her unborn son.

The mother, known only as ceramic_elephant, posted the letter to Reddit this month.

It's a refreshingly honest, warts-and-all insight into pregnancy and all the frustration and discomfort that comes with it. And she definitely doesn't hold back...

She wrote:

If you've ever been pregnant, we're guessing you were laughing along while reading that.

And other pregnant women and mums were too - p_kitty wrote "Thank you for the lolz while I sit here, dispensing Cheerios in a neverending stream to the small, snot spewing, feverish, Tylenol dosed, teething, miserable being that is my toddler...".

edgarok commented "Hahaha reading this while trying to poop again for the millionth time today and I'm only 8 weeks. Looks like I have a long road ahead of me" while JustEnuff2BDangerous added "I've already instructed husband he is to ensure I have sushi on my hospital bedside table for dinner the evening after I have my c-section. I've also instructed him on the exact brand of peach moscato I want. Screw a push present, GIVE ME RAW FISH AND WINE."

Check out the video below for funny pregnancy facts. Post continues after video...

We hope the writer shows the letter to his son when he's old enough to appreciate it...

That was your biggest pregnancy gripe?

TAP on the image below and scroll through the gallery to see awesome pregnancy announcements we found...

GALLERY: Awesome pregnancy announcements.

Ice ice baby.

Books and junk food.

It's not him.

Baby duty.

Beer and baby bellies.

Eviction notice.

Who's player 2?

Eviction notice.

Pregnant or hungover?

Books and junk food part 2.

Belly art.

Not good news for all?

We are Prego.

Getting the kids involved.

Getting the kids involved.

Movie announcement.

We are knocked up.

Getting the pets involved.

Getting the pets involved.

Getting the kids involved.

Cravings already?