Michael Phelps' Wife Nicole Shares Friendship Bracelet Son Boomer Made Baby Brother Nico: 'The Sweetest'

The adorable gesture between brothers melted the newly minted mom of four's heart

Michael Phelps' older sons have grown fond of their baby brother.

The Olympic swimmer's wife Nicole shared a sweet photo on her Instagram Story Thursday of infant son Nico Michael, 4 weeks, laying with a tiny friendship bracelet on his wrist.

"Booms made his brother the sweetest bracelet," the newly-minted mom of four shares, referencing the couple's oldest son, 7-year-old Boomer.

The Phelps are also parents to sons Maverick, 3, and Beckett, 5.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

Related: Michael Phelps and Pregnant Wife Nicole Pose with Their Three Sons as They Celebrate Thanksgiving

Earlier this month, the couple shared a joint post on Instagram featuring a photo of the couple's three sons holding their new baby brother.

"✨2 weeks in as a family of 6 and we couldn’t be happier✨ someone called Nico the family baby and it’s 100% true," the couple wrote in their caption.

"The boys can’t get enough of their newest brother and want nothing more than to love on him, care for him (and mama) and just be near."

"I wasn’t sure what life would be like with a newbie and one more babe…. it’s like a puzzle piece we didn’t know was missing 🩵," they concluded their post.

The parents of four boys announced on Instagram that their family was growing yet again in an anniversary post shared in January.

The pair — who have been married since 2016 — posed for a photo at a recent NFL game where Johnson put her baby bump on display.

The mom of four shared the Instagram post to celebrate the couple's new addition, as well as her seventh anniversary with the Olympic champion swimmer.

"For those that are wondering… yes! we’re expecting our 4th Phelps in 2024 💙💙💙💙," Johnson wrote alongside the carousel of images.

For more People news, make sure to sign up for our newsletter!

Read the original article on People.