Meet Alexis Olympia Ohanian Jr. The little girl, named after her Reddit co-founder father, made her social media debut about two weeks after her tennis champ mom Serena Williams gave birth. Williams posted an Instagram photo of the newborn, while Ohanian posted a YouTube video showcasing the pregnancy journey—from first ultrasound to the day the couple brought Alexis Jr. home from the hospital, "six, seven days" after she was born, Williams says in the video. "We had a lot of complications, but look who we got," she says. "We got a baby girl. Junior." In his own Instagram post showing the family in the style of the Reddit logo cartoon character, Ohanian called their daughter "already mama's perfect sidekick." (More Serena Williams stories.)