Yes, the birth was natural, it happened in a manger, and Mary went through the normal pains labor, most natural. He was begotten by God, because God is His Father, and He is the Son, just as you have a father.
Jesus left the shroud wrappings without unwrapping them and left the stone tomb without rolling away the stone sealing the entry. He could just as easily be born without passing through the birth canal, Seven. THEN He was laid in a manger.