Pope Francis adjusts his white zucchetto, or skullcap, after a child took it off during a meeting with children and volunteers of the Santa Marta Vatican Institute, at the Vatican, Saturday, Dec. 14, 2013. (AP Photo/Gregorio Borgia)  (ASSOCIATED PRESS)

Pope Francis meets children at the Vatican, Saturday, Dec. 14, 2013. Pope Francis has received a candle-topped birthday cake three days early, a surprise from children at the Vatican. The pontiff turns 77 on Dec. 17. A group of children on Saturday presented him with the treat after he visited a Vatican dispensary which provides pediatric care. Francis blew out the candles. Thanking the youngsters for the cake, he promised: "I'll tell you later if it's good or not." The dispensary on the Vatican grounds has been distributing for more than 90 years milk, clothing, diapers, toys and even baby carriages to families in need. (AP Photo/Gregorio Borgia)  (ASSOCIATED PRESS)

A child takes off Pope Francis' white zucchetto, or skullcap, during a meeting with children and volunteers of the Santa Marta Vatican Institute on Saturday at the Vatican.  (ASSOCIATED PRESS)

A child takes off Pope Francis' white zucchetto, or skullcap, during a meeting with children and volunteers of the Santa Marta Vatican Institute, at the Vatican, Saturday, Dec. 14, 2013. (AP Photo/Gregorio Borgia)  (ASSOCIATED PRESS)