MADRID Spain's future queen, Princess Letizia, gave birth to her second child, Sophia, on Sunday.
The baby is third in line to the throne behind her father Crown Prince Felipe and 1-1/2 year-old sister Leonor.
The baby was born by caesarian section and weighed 3.31 kilograms (about 6 lbs, 12 oz), Prince Felipe told journalists. He said his wife and baby were in good health.
The birth of another princess delays any immediate pressure for Spain to reform its constitution which gives men precedence over women in the line of succession.
Under the current constitution, if Felipe and Letizia ever have a boy, he would leapfrog Leonor and her sister and succeed Felipe, who himself has two elder sisters.
Spain's Socialist government has promised to change the constitutional rule, though this would need the support of two-thirds of both houses of parliament and require parliament to be dissolved and new elections called.
The royal household broke with tradition last November when it announced the baby's sex just eight weeks into Letizia's pregnancy thus avoiding controversy over the succession issue.
Letizia, a divorcee and daughter of a journalist and a union leader, was a well-known television news presenter before marrying Felipe in May 2004.
Opinion polls show most Spaniards support the monarchy, though a sizeable minority say they have little or no confidence in the institution.