Rosie and Ruby's mom says sometimes she forgets her girls were ever conjoined.

ruby and rosie formosa
Credit: Press Association/YouTube

In 2012, Rosie and Ruby Formosa were born conjoined at the abdomen and sharing an intestine. According to The New York Times, doctors estimated they had a 20 percent chance of survival after their mom, Angela Formosa, delivered them via C-section at 34 weeks, and doctors rushed them into surgery in an attempt to separate them.

But the girls beat those odds, and this week, the now-4-year-olds start kindergarten in London.

Formosa, who learned her twins were conjoined while they were in utero, said, "When I was pregnant I didn't think I'd ever see their first day at school so it is really amazing and all thanks to Gosh [Great Ormond Street Hospital] really." She adds, "They've met their teacher a few times and they love their teacher. They're looking forward to painting, anything messy, [and] they love reading."

Indeed, by all accounts, today Rosie and Ruby seem to have a very "normal" life. That is very much how the girls appear in a Press Association video that shows them getting ready for their first day of school. In fact, Formosa says sometimes she forgets how "special" her daughters really are.

"They are very similar, they are very bubbly little girls, they are very headstrong and very determined, which I knew they were from when they were in my belly because of the way they kept growing and surviving," Formosa says of her girls.

Here's hoping Rosie and Ruby thrive in kindergarten this year!

Meanwhile, their story makes me realize how special it is to be able to go to kindergarten in the first place, something my middle daughter is getting ready to do next week. Sniff. I may miss her terribly, and still be in denial that she is old enough for "big girl school" but I am feeling so lucky today that she is able to go out on her own, without looking back.

Melissa Willets is a writer/blogger and a mom. Follow her on Twitter (@Spitupnsuburbs), where she chronicles her love of exercising and drinking coffee, but never simultaneously.