Serena Williams officially announces birth of her daughter, Alexis Olympia

2016 US Open Tennis Championships - Day 2 Featuring: Serena Wiliams Where: New York City, New York, United States When: 30 Aug 2016 Credit: Macguyver/

Tennis star Serena Williams officially announced the birth of her daughter, Alexis Olympia Ohanian Jr. on social media Tuesday.

Alexis Olympia was born on September 1 and weighed 6 pounds, 14 ounces. She is Williams first baby with Reddit co-founder Alexis Ohanian.

Serena Williams documented her baby's "amazing journey" into the world in short video.

The 35-year-old Williams won her 23rd Grand Slam singles title in January at the Australian Open in January, while she was pregnant.

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