When does a girl's custody transfer from her mother to her father: is it after she completes her seventh year, or at the end of her sixth and the beginning of her seventh?

The Hanbalis are of the view that custody of a daughter transfers from the mother to the father upon her completion of seven years, not merely upon her entering that age. This is because the father is better able to protect her and has a greater right to her guardianship. He can also safeguard her from the entry of women into her life, which could expose her to dangers and the fear of deception, given her approaching readiness for marriage.