Caterina Scorsone Hikes with Daughter Pippa, 7, on Her Hip as Her Family Celebrates World Down Syndrome Day

In addition to Pippa, the actress is mom to daughters Lucky, 4, and Eliza, 11, who she shares with ex-husband Rob Giles

Caterina Scorsone and her family are celebrating World Down Syndrome Day.

On Thursday, the Grey's Anatomy actress, 42, shared a photo on her Instagram with her daughter Pippa, 7. Hiking together along a rocky terrain, Scorsone had Pippa on her hip, posing in a brown cowboy hat and blue sweatshirt.

"Happy World Down syndrome day from our family to yours. 💛💙 @globaldownsyndrome," the proud mom wrote in her caption.

World Down Syndrome Day occurs on March 21st and celebrates the uniqueness of the triplication (trisomy) of the 21st chromosome, which causes Down syndrome. The day has been observed by the United Nations since 2012.

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Related: Caterina Scorsone Hugs Daughter, 6, While Celebrating World Down Syndrome Day: 'Exactly as We Are'

In addition to Pippa, Scorsone is mom to daughters Lucky, 4, and Eliza, 11, who she shares with ex-husband Rob Giles.

In an interview with PEOPLE in 2020, Scorsone shared that her second daughter's "difference lit a match in my life and in the life of my family."

"When my daughter Pippa was born, I was scared. I didn't know anything about trisomy 21, the name for the occurrence of a third copy of the 21st chromosome, better known as Down syndrome," she told PEOPLE. "... I didn't know anything. All I knew about Down syndrome was that people were afraid of it, so I figured I should be too."

The actress noted that her perspective quickly changed, seeing Pippa's differences as individuality, just like anyone else's unique attributes. She added that Pippa's arrival "cracked open a door in my life" — for the better.

"It suddenly became crystal clear," she said, adding, "There is no standard, objective, perfect human being. The metrics of perfection are arbitrary and imposed in the service of those who fit them. My daughter is perfect. Exactly the way she is."

"Pippa is perfect exactly as she is. So are you, and so am I. The only way we lose sight of that perfection is to look for it somewhere else," the mom of three said.

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