I find that the speaker may be alluding to different ideas in this line. His daughter, who passed at only six months, will be safeguarded of her innocence as she will not experience any form of hatred or danger in the mortal world. Yet, I also believe it applies to the sacrament of baptism which ties to her innocence. Baptism is performed a few weeks after birth for purity in the eyes of God. Therefore, Mary is pure and innocent as she goes to heaven.