This is a sweet moment when a non-verbal boy asked to hold his baby brother on his lap.

Karen Morici, 42, was filming her youngest son, Johnny Farrell, who was almost seven months old, hoping to capture his first attempt at crawling.

Instead, she recorded a touching moment of brotherly love when her older son, Dominic Morici, seven, requested to hold his baby brother.

Dominic has Congenital Disorder of Glycosylation (CDG), a rare genetic condition that causes poor growth, low muscle tone and developmental delays.

Footage shows Karen gently placing Johnny onto Dominic's lap, and the older boy's face instantly lights up with happiness.

Karen, from Chicago, Illinois, said: "I originally started recording to see if I could catch my baby Johnny crawling for the first time."

"But instead, I captured something even sweeter."

"Dominic absolutely lives for these moments."

"His reaction when he finally got Johnny on his lap was pure joy."

"Their brotherhood is the most precious thing, and this video shows just how much they adore each other."