Yes I am currently reading/studying Exodus.
Infanticide. A lot of that going on here and now if I am not mistaken about the current news.
You see Pharaoh went beyond a certain point (Romans 1) and was before chapter 3 was given over to a depraved mind as in Romans 1:28-32 ?
And just as they did not see fit to acknowledge God any longer, God gave them over to a depraved mind, to do those things which are not proper, 29being filled with all unrighteousness, wickedness, greed, evil; full of envy, murder, strife, deceit, malice; they are gossips, 30slanderers, haters of God, insolent, arrogant, boastful, inventors of evil, disobedient to parents, 31without understanding, untrustworthy, unloving, unmerciful; 32and although they know the ordinance of God, that those who practice such things are worthy of death, they not only do the same, but also give hearty approval to those who practice them. (Romans 1:28-32)
I would ask, why then did God have to harden Pharaoh if he was already beyond the point and given over to depraved mind?
I think it important to point out that the Pharaoh of chapter 1, the baby killer, is not the same Pharaoh of the plagues. Even if that next Pharaoh was the son of the baby killer, he would not incur judgment for the direct sin of his father. He may suffer its consequences as we see his entire kingdom go to shambles for previous Pharaohs oppressing God's Chosen People, the sons of Jacob.
Exodus 2: NASB
23Now it came about in the course of those many days that the king of Egypt died. And the sons of Israel sighed because of the bondage, and they cried out; and their cry for help because of their bondage rose up to God. 24So God heard their groaning; and God remembered His covenant with Abraham, Isaac, and Jacob. 25God saw the sons of Israel, and God took notice of them.