Two thoughts. First, we hear the Magnificat in our Gospel today, Mary’s song of joy in knowing that the presence of the Lord was growing in her. Jesus, and his presence, grows in us too! Always growing. Especially by power of the Eucharist.
Second, we see in our first reading Hannah, who had prayed deeply for a son, giving that son God gave her back to the Lord. Consecrating him back to God. That is what happens in baptism: we dedicate the child to the Lord. Hannah is a prefiguring of Mary. And in our Gospel we see Mary so happy to know she had been gifted with life, and not just any life, but the life of Jesus. As we are just days away from Christmas, we remember the excitement and joy Mary had just days before Jesus’ birth. And we share in that.