How should a girl under two years old be treated? Are there any hadiths or Quranic verses that clarify this? Can you provide me with websites or books that address this topic for the pre-two-year-old stage?

If the question is about rulings concerning minors, these include the nullification of ablution by touching their private parts, and looking at, touching, and kissing non-mahram (definition) girls.

As for the intent being the upbringing of young children, Allah has entrusted us with the responsibility of raising them and teaching them what Allah has obligated upon them, based on His saying, the Almighty: "O you who have believed, protect yourselves and your families from a Fire," and His saying: "And enjoin prayer upon your family and be steadfast therein."

The Prophet, peace and blessings be upon him, warned against neglecting this trust, saying: "Indeed, all of you are guardians, and all of you are responsible for your wards." Islam specifically allocated greater care and nurturing for daughters.

Psychologists and educators recommend focusing on the first five years of a child's life in their upbringing. It is advised to refer to books such as: "The Muslim Father's Responsibility in Childhood" by Adnan Baharith, "The Prophetic Method of Child Rearing" by Muhammad Nour Suwaid, "Raising Children in Islam" by Abdullah Nasih Ulwan, and "The Return of the Hijab (definition)" by Muhammad Ahmed Ismail. It is also recommended to visit "Al-Murabbi" website by Sheikh Muhammad Al-Duweish, and to listen to the lectures of Sheikh Abdul Karim Bakkar and the series "Towards Eradicating Educational Illiteracy" by Sheikh Muhammad bin Ahmed bin Ismail.