Sania shared the news on social media with a cute picture which she posted and captioned it as, "#BabyMirzaMalik 👶🏽❤️".
#BabyMirzaMalik 👶🏽❤️ pic.twitter.com/RTYpqok1Vl
— Sania Mirza (@MirzaSania) April 23, 2018
Mirza has won six Grand Slam doubles titles, including the 2015 Wimbledon ladies' doubles with Martina Hingis.
Her most recent appearance on the WTA Tour came at the China Open in Beijing in September. She has not played since because of a knee injury.
In 2005, she became the first Indian player to win a WTA tournament singles title and in 2015 the first Indian woman to top the world doubles rankings.
She is one of the biggest stars in Indian sport and has almost 25m followers combined on her Facebook, Twitter and Instagram accounts.