Serena Williams on her decision to stop breastfeeding

Serena Williams is opening up about motherhood.

The tennis star -- who won her first Wimbledon match of the year on Monday,  just a month after withdrawing from the French Open due to a chest muscle injury -- spoke about her decision to stop breastfeeding her daughter Olympia, whom she shares with husband Alexis Ohanian, co-founder of Reddit, at a news conference in London on Sunday.

"I feel like everyone says, 'You're so thin when you breastfeed,'" she explained at the conference, according to Today. "What I've learned through the experience: everybody is different, every person is different, every physical body is different. For my body, it didn't work, no matter how much I worked out, no matter how much I did, it didn't work for me."

Along with her regular workouts and vegan diet, once she stopping breastfeeding the now 10-month-old, Williams immediately started dropping weight, losing 10 pounds in just a week.

"It was crazy. I just kept dropping. That's when I learned that everything was different," the 36-year-old said. "Sorry to go on about that, but I wanted to say that so women out there know that's not true. Everyone takes things different. I think it’s important for us to share that message."

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Williams, who gave birth in September, said she originally planned to stop breastfeeding Olympia in January, but kept extending the end date.

“Then January became March. March became April. I was still breastfeeding," she said. "For me, it was really important to make it through three months, then it was important to make it to four months. I was like, 'OK, I can do six months.'"

Though she's ultimately happy with her decision to stop, it definitely wasn't an easy one to make.

"I literally sat Olympia in my arms, I talked to her, we prayed about it," she said. "I told her, ‘Look, I’m going to stop. Mommy has to do this.’ I cried a little bit, not as much as I thought I was. She was fine."

ET caught up with Williams in March where she opened up about mom guilt and wanting another baby.

"Working motherhood is real. It's so real," she joked. "But I have my priorities and Olympia is that. And Alexis works all the time as well. He's not even here right now, he's working on his new VC fund. So, that's great! But I'm never a day without Olympia. She's my priority, and every day I need to be home with her. I don't wanna miss any moments with her."

She continued: "I definitely want two [kids], God willing. But right now, I want tennis as well. So, I'm going to wait and see what happens."

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Serena Williams in 2018
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Serena Williams in 2018
MIAMI, FL - MARCH 19: Serena Williams is seen at the 2018 Miami Open Hard Rock Stadium Ground Breaking Ceremony at Hard Rock Stadium on March 19, 2018 in Miami, Florida. (Photo by Alexander Tamargo/WireImage)
INDIAN WELLS, CA - MARCH 12: Venus Williams and Serena Williams pose for a photo before their match against each other during the BNP Paribas Open at the Indian Wells Tennis Garden on March 12, 2018 in Indian Wells, California. (Photo by Harry How/Getty Images)
INDIAN WELLS, CA - MARCH 10: Serena Williams ( USA ) hits a backhand the second round of the BNP Paribas Open on March 10, 2018, at the Indian Wells Tennis Gardens in Indian Wells, CA. (Photo by Adam Davis/Icon Sportswire via Getty Images)
INDIAN WELLS, CA - MARCH 08: Serena Williams leaves the court after defeating Zarina Diyas of Kazakhstan during the BNP Paribas Open at the Indian Wells Tennis Garden on March 8, 2018 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)
NEW YORK, NEW YORK - MARCH 5: Serena Williams of the United States in action during the Tie Break Tens Tennis Tournament at Madison Square Garden on March 5, 2018 New York City. (Photo by Tim Clayton/Corbis via Getty Images)
NEW YORK, NEW YORK - MARCH 5: Venus Williams of the United States and her sister Serena Williams of the United States during the Tie Break Tens Tennis Tournament at Madison Square Garden on March 5, 2018 New York City. (Photo by Tim Clayton/Corbis via Getty Images)
LA QUINTA, CA - MARCH 06: Serena Williams attends 14th Annual Desert Smash Celebrity Tennis Event on March 6, 2018 in La Quinta, California. (Photo by Michael Bezjian/Getty Images for Kelly Howard)
LA QUINTA, CA - MARCH 06: Serena Williams attends 14th Annual Desert Smash Celebrity Tennis Event on March 6, 2018 in La Quinta, California. (Photo by Michael Bezjian/Getty Images for Kelly Howard)
NEW YORK, NY - MARCH 05: Serena Williams of the United States reacts during her match against Shuai Zhang of China during the Tie Break Tens at Madison Square Garden on March 5, 2018 in New York City. (Photo by Elsa/Getty Images)
NEW YORK, NY - MARCH 05: The United States Women's Olympic hockey team poses with their gold medals and tennis champions Serena Williams anf Venus Williams during the Tie Break Tens at Madison Square Garden on March 5, 2018 in New York City. (Photo by Elsa/Getty Images)
ASHEVILLE, NC - FEBRUARY 11: Serena Williams of Team USA reacts after a shot to Lesley Kerkhove and Demi Schuurs of the Netherlands during a doubles match in the first round of the 2018 Fed Cup at US Cellular Center on February 11, 2018 in Asheville, North Carolina. (Photo by Richard Shiro/Getty Images)
ASHEVILLE, NC - FEBRUARY 10: Serena Williams of Team USA, bottom left, along with her husband Alexis Ohanian and their daughter Alexis Olympia, center, watch the action during the first round of the 2018 Fed Cup at US Cellular Center on February 10, 2018 in Asheville, North Carolina. (Photo by Richard Shiro/Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 30 : Serena Williams of United States in action during her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Mahmoud Khaled/Anadolu Agency/Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 30 : Serena Williams of United States is seen after her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Mahmoud Khaled/Anadolu Agency/Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 30: Serena Williams of United States smiles during her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Tom Dulat/Getty Images)
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