Serena Williams has spent every day with her daughter since her birth.

The tennis star feels ''so fortunate'' to have spent every single day with her 10-month-old daughter Alexis Olympia Jr.

She wrote on Twitter: ''319 days since I gave birth to this amazing baby @OlympiaOhanian I've spent 319 of those days with her. I'm so fortunate. (sic)''

Meanwhile, Serena previously confessed she cried every time her daughter did in the early stages of motherhood.

She said: ''It's tough in the beginning. The baby's crying all the time and you don't know why - you don't know if it's gas, you don't know if she's sick, you don't know if it's just colic. So I just started crying with her because I couldn't help her and I wanted to help her and I couldn't, so I just started crying.''

And her admission comes after she revealed she prayed and ''cried a little bit'' when she stopped breastfeeding Alexis.

She added: ''I literally sat Olympia in my arms, I talked to her, we prayed about it. 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 would ... After [I stopped breastfeeding], like literally I lost 10 pounds in a week. It was crazy. I just kept dropping. I was like, that's when I learned that everything was different. Sorry to go on about that. 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.''