How time flies! Rebecca Adlington's little monkey is six months old

In the blink of an eye, Rebecca Adlington's daughter has grown up fast. The Olympic swimmer welcomed her first child six months ago, and Becky, as she is known by her family and friends, can hardly believe it.

Sharing what is possibly the cutest picture to date, Becky marked her baby's milestone. "Can't believe this little monkey is 6 months old today!! Where has the time gone?! #mybaby #6months #love #family," she wrote.

Becky's love and pride for her little girl was clear from her caption. Similarly, baby Summer was the picture of happiness as she crawled around on the floor and cheekily grinned at the camera.

Cant believe this little monkey is 6months old today!! Where has the time gone?! #mybaby #6months #love #family

A photo posted by Becky Adlington (@beckadlington) on

Rebecca Adlington and her husband Harry Needs welcomed baby Summer on 8 June

To celebrate her milestone, her proud dad and Becky's husband Harry Needs also created a sweet Flipgram of his smiley daughter. "6 Months old & Growing up way to fast & Little diva & a Daddys girl," he wrote.

Personal trainer Harry followed it up with another photo of his gorgeous wife wearing a fitted red dress, and joked about having three more children with Becky.

"Happy half a year since birth my beautiful wife @beckadlington #lookamazing #worksohard #pthusbandlife #chairtyevent #3moretimestogo," he wrote.

6 Months old 😱 & Growing up way to fast 😱 & Little diva 😱 & a Daddys girl 😍

A video posted by Harryneeds (@harryneeds) on

"Little diva & a Daddy's girl," Harry called his daughter

Becky, who showed no signs that she had given birth six months ago, replied: "Thank you to my wonderful husband for his comments... #nothaving3morekids."

The 26-year-old has been flaunting her post-baby body on holiday recently. Earlier this month the family-of-three were holidaying in the Caribbean island of Antigua, where Becky no doubt enjoyed a few dips in the pool with her daughter.

The family-of-three have just come back from a holiday in Antigua

Baby Summer also experienced her first taste of swimming in the sea. "She loved it!" her proud mum wrote on Instagram.

With two experienced swimmers as parents, it's no wonder that Summer is a little water baby. She had her first splash in the pool when she was six weeks old.

"Summer was absolutely brilliant in the water," Becky told HELLO! Online

"It was absolutely brilliant," Becky told HELLO! Online in July. "You never know how babies are going to react but Summer was absolutely brilliant in the water. Harry and I go in the water and pass her to one another and take turns going under the water. She comes back up, blinks a lot and there's been no tears at all. It's going really well so far.

"She can't do much at this stage – we can't take her to the zoo and she doesn't really play with toys yet – but swimming is the one thing she can do and we can all do it together as a family."