Saint Gerard Majella is the  saint whose intercession is requested for children (and unborn children in particular), childbirth, mothers (and expectant mothers in particular), motherhood, falsely accused people. He was beatified in Rome on January 29, 1893, by Pope Leo XIII. He was canonised less than twelve years later on December 11, 1904, by Pope Saint Pius X. 

Prayer

O great Saint Gerard, beloved servant of Jesus Christ, perfect imitator of thy meek and humble Savior, and devoted child of the Mother of God, enkindle within my heart one spark of that heavenly fire of charity which glowed in thee and made thee a seraph of love.

O glorious Saint Gerard, because when falsely accused of crime, thou didst bear, like thy Divine Master, without murmur or complaint, the calumnies of wicked men, thou hast been raised up by God as the patron and protector of expectant mothers. Preserve me from danger and from the excessive pains accompanying childbirth, and shield the child which I now carry, that it may see the light of day and receive the the purifying and life giving waters of baptism, through Jesus Christ our Lord. Amen.