“It is with our greatest sadness that we have to announce the passing of our baby boy,” the Manchester United striker wrote in a message also signed by his partner, Georgina Rodriguez.
“It’s the biggest pain a parent can feel.”
Ronaldo announced last year that the couple were expecting twins.
“Only the birth of our baby girl gives us the strength to live this moment with some hope and happiness,” he wrote on the social media post.
“We are all devastated by this loss,” the post added, “and we kindly ask for privacy at this very difficult time. Our baby boy, you are our angel. We will always love you.”
Ronaldo already had four children.
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