Serena Williams' Newborn Daughter Adorably Flexes Her Muscles in Her Sleep: 'Biceps'

The tennis pro and her fiance, Alexis Ohanian, created an Instagram page for their baby girl.

Serena Williams' baby girl, Alexis Olympia Ohanian Jr., is just like her mama!

The 35-year-old tennis pro and her fiancé, Alexis Ohanian, shared an adorable pic of their newborn daughter on her Instagram account on Friday, where she's seen fast asleep and flexing her tiny muscles.

Simply captioned "Biceps," little Alexis is sporting a navy onesie with the phrase "Smart and Strong like my Mama" written in pink and white.

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Alexis Olympia was born on Sept. 1 and is the couple's first child together. Williams first introduced her baby girl to the world on Wednesday, with a sweet pic on her Instagram and another on her daughter's social media page.

"Thinking about mommy and daddy ]]>🏃🏿👨🏻💻