Can the expiation for breaking an oath (kafarat ul yameen) be given for a young infant child who does not eat food and who only drinks breast milk or infant formula? If the expiation is given and the person forgets about this situation (it is given to an infant), should the person repeat giving the kafara to a poor person?

I ask Allah to bring the victory by your hands soon, for He is the Guardian and the All Able. My question is about the concept of renewal mentioned in the Hadith of the Messenger (saw)

a) Are Harut and Marut angels? Or are they from mankind with angelic qualities? There are sheikhs who say that they are people who have great knowledge, according to the meaning of the Arabic language. And if they are angels, how did they communicate with the humans at that time?

My question is related to the Fajr prayer, which is known for its timing with the call to prayer in all countries, which is with the darkness of the night, i.e., before dawn. My question is when is the Fajr prayer correct, is it with the call to prayer or with the break of the true dawn (buloogh alfajr)?