Pope Francis reiterates that "abortion is a grave sin" ending an innocent life, but he adds, "there is no sin that God's mercy cannot reach."
Pope advises that contraceptives, which have been traditionally opposed by the Catholic Church, can be used to fight the outbreak of Zika virus.
The religious leaders say efforts should be aimed at curbing mosquito menace and not to legalize abortion.
A second miracle was attributed to Mother Teresa's name, so her sainthood will be completed next year.
A sick toddler has made a miraculous recovery after receiving a kiss from Pope Francis, the family from Philadelphia said.
Pope Francis had his lung removed as a teenager due to a lung infection.