Rebirth of the Last Demon

When he wakes up, he finds himself in the arms of a beautiful woman and the watchful eye of a handsome gentleman. He has been reborn into the most prominent rank of the New World... The Royal Family. With no memory of his past and in the body of a baby, the young man must create his own destiny using the advantage of his mental age in the body of a newborn.

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Clarification: The MC is not a hero, his ideals do not go hand in hand with what you might associate with a good person. However, he is not a heartless, cynical monster. But if you are looking for a kind MC, with aspirations inclined to save the weak using his body as a shield, empathic, this is not your MC.