Sometimes it is so hard to catch all of your child’s first milestones, from their first step to their first words.

When you’re a working mum and a Tennis superstar it’s almost impossible and no one knows that more than Serena Williams.

On Saturday, the tennis star revealed that while she was training for Wimbledon, her 10-month-old daughter Alexis Olympia took her first steps and when she heard the news, she cried.

She tweeted: She took her first steps… I was training and missed it. I cried.

See her tweet below: