The footballer's girlfriend Georgina Rodriguez was pregnant with a boy and a girl.
The girl was born, and the boy, despite the best efforts of doctors, could not survive, according to the Daily Mail.
The forward of the Portuguese national team in October 2021 announced that the couple was expecting the birth of twins.
Earlier it was reported that Ronaldo became the first player over 36 with 15 goals in a season in the Premier League.