Whitney Port Wishes Son Sonny Sanford a Happy 5th Birthday: 'You're a Little Firecracker'

"You tested me there for a few years, but just like everything in life, anything worth having is hard work," Port wrote of her son, Sonny Sanford, whom she shares with husband Tim Rosenman

https://www.instagram.com/p/Cfrm4b7vQfQ/ whitneyeveport's profile picture whitneyeveport Verified Showering my boy with kisses and love. Heartbroken over the lives lost on July 4th and devastated over the state of our country. It isn't stopping, and I feel so helpless. I don't know what else to say, so I am going to share some resources. First, I linked a GoFundMe page in my stories and bio. raising donations for the victims of the Highland Park shooting. Donations will go towards funeral costs, medical bills, and mental health support. Donate if you can. Second, I spoke with @alenciajohnson about about the overturn of Roe v Wade and abortion. We talked about how we got here, what this means, and what we can do to help. Link in bio. to listen to our conversation on my podcast AND visit my stories for a list of resources she shared. Alencia is a social impact, brand engagement and communications strategist with corporate, political and non-profit experience. She spent six years at Planned Parenthood Federation of America, where she engaged political, media, entertainment and corporate organizations and influencers to shift mainstream culture with positive, inclusive and factual perceptions of gender equity and women’s rights. 3w
Photo: whitneyeveport/Instagram

Whitney Port's little man is growing up!

The fashion designer, 37, penned a touching tribute to her son, Sonny Sanford Rosenman — whom she shares with husband Tim Rosenman — on Instagram Wednesday in honor of his 5th birthday.

Alongside an adorable clip of Sonny performing a song for his mom, she wrote, "HI FIVE! HAPPY 5TH BIRTHDAY TO MY RAY OF 🌞 , SONNY! You tested me there for a few years, but just like everything in life, anything worth having is hard work."

She added, "You're a little firecracker, and I can't wait to watch you light up this world."

As part of the birthday festivities, Port and Rosenman spent the day celebrating with Sonny. According to Port's Instagram Stories, the father-son duo had some fun waving around their toy light sabers before the family gathered for Sonny's "sun celebration" at school camp.

Whitney Port/Instagram

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In February, Port told PEOPLE that she and Rosenman are "in the discovery phase" of expanding their family and had recently met with a fertility doctor.

Whitney Port/Instagram

At the time, Port revealed she and Rosenman suffered a pregnancy loss last November, two weeks after announcing she was seven weeks pregnant with "likely another unhealthy pregnancy." Port has previously suffered two miscarriages and a chemical pregnancy.

RELATED VIDEO: Whitney Port Stopped Breast Feeding Two Weeks After Giving Birth: 'It Was Just Too Painful'

"We had a consultation with a fertility doctor before we had our winter break. We now go in in a couple of weeks to do the first testing, like blood testing, follicle testing and Timmy gets his sperm tested, and we kind of take it from there," she said earlier this year on PEOPLE's Me Becoming Mom podcast.

"I've been sent a list of supplements and vitamins and diet recommendations to start to get into for both Timmy and me," she continued. "I'm a little overwhelmed already, it already starts to feel like, oh my gosh now someone else is watching my life."

She added, "It's also hard for me because I just only had my D&C three weeks ago at this point, so I'm still very early in the discovery, I don't even know when the date of my last period is. You realize how much you have to get into all those details and the timing and it just becomes like a whole other job."

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