Rio De Janeiro: Ronaldo's fiancÃ©e, Maria Beatriz Antony, on Wednesday gave birth to the striker's second child, a hospital spokeswoman said.
Antony gave birth to Maria Sofia in Rio de Janeiro's Clinica Perinatal, hospital spokeswoman Ana Maria Funky said by telephone, adding the baby was born weighing 2.98 kilograms (6.57 pounds).
She said Ronaldo was present when his daughter was born and cut the umbilical cord.
Funky said both mother and daughter were in perfect health and should leave the hospital no later than Friday.
Ronaldo, who is recovering from knee surgery and recently signed with Brazilian club Corinthians, already has an 8-year-old boy, Ronald, from a previous relationship.
The three-time FIFA player of the year hasn't played since injuring his knee in February while representing AC Milan in the Serie A.
Ronaldo led Brazil to the 2002 World Cup title in South Korea and Japan, scoring twice in the final against Germany.