Three years and one day

Hello, Your Honor,
While studying the Strong Hand, I came across the laws of marriage, and the issue of the sanctification of a minor daughter, which is found in Chapter 3. According to the scripture, a father is given halakhic permission to sanctify his daughter in marriage from the moment she is three years and one day old until she reaches adulthood. I saw another question on the site about 'the attitude of the halakhic law to pedophilia' in which you wrote that the halakhic law is separate from morality and therefore has no relation to the moral aspects of rulings. However, especially in this specific halakhic law, it is impossible not to be shocked at the thought of this matter and the halakhic reference that the father receives for such an act. It is difficult for me to accept that the Torah, as a law of life that should not be disconnected from any aspect of humanity, would allow a father to give his daughter to another person in order to have her impregnated at such a young age.
In other words, I can live with the fact that halakha is generally disconnected from morality. But seeing such a halakha without any attempt to prohibit or restrict it makes me feel really bad about the matter.
Are there other aspects of Judaism that prohibit this? Was there even a relationship to the issue in Judaism at the time of Maimonides or before, beyond the halakhic aspect?
I would be happy if you could help me sort this out, thanks in advance.