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Alexis Olympia Ohanian turned two on Sept. 2, and proud mom Serena Williams took the opportunity to reflect on the past couple of years. On Sunday, Serena shared a special photo from Olympia's birth, with husband Alexis Ohanian by her side.

"The last 2 years have been my greatest accomplishment," Serena wrote in the caption. Serena overcame tremendous health difficulties following complications surrounding Olympia's delivery [2], and later felt penalties put on her tennis career [3] simply for giving birth. She's transparent about the realities of being a working parent and advocates for adequate paternity leave [4] for moms and dads.

Despite these challenges, adorable Olympia clearly brings joy to Serena and Alexis's lives. They share plenty of heartwarming moments, both on the court and on Instagram — where Olympia has her own account. This sweet family teaches us more and more every year, and we're excited to see what the next brings for the Williams-Ohanian crew.