It's one of the first close-up photos of Summer that Adlington has put on Instagram and it very clearly shows the little one has her mother's eyes and blonde hair.
The Olympic swimmer simply captioned the photo with three hearts.
What an absolute cutie.
The new mum recently spoke to HuffPost UK Parents about how she was settling into motherhood and family life.
She said: "It's so nice now that we've had a few weeks to let it all calm down and settle into a bit more normality and just enjoying being with her.
"She started smiling, she's awake a little bit more, we've taken her for a swim and you just kind of come into your own a little bit which is really nice."
Adlington married personal trainer Harry Needs in September 2014 and the couple announced they were having their first child together in December 2014.
Needs has also been documenting his journey as a new dad on Instagram by posting this adorable snap of the sleep issue he seems to be facing with baby Summer.
He wrote in the caption: "When you both tired as each other, but you want to out stubborn the other person."
Family life is pretty sweet in the Needs household.