It seems retarded due to the skewed explanations we have. A lot of these things aren't to be taken literally. Indeed, it symbolizes progression in that Children represent progression. As Osiris progressed through his son Horus, a snake sheds its skin, leaving behind the unnecessary for the necessary. It's another symbol for infinity, immortality/divinity. All of these topics are at least adjacent. Oh and also https://youtu.be/CF-c1K3WWg4