Warm words of congratulations poured in from around the world for Britain’s Prince William and his wife Kate following the birth of their first baby, a boy destined to become king. US President Barack Obama and his wife Michelle led the tributes, saying the birth was a “joyous occasion” and wishing the new parents “all the happiness and blessings parenthood brings.” The Duchess of Cambridge gave birth to a healthy male heir weighing 8lbs 6oz (3.8 kilos) in London on …