The first is, you don’t have a baby, you have a person in the guise of a baby. If we don’t keep that in mind the person is always going to stay a baby through out the life.
Second, two skills that any person would need are, problem solving and communication. Everyone needs to solve complex problems, and to communicate effectively. So, the person who stepped into the world holding your fingers would need the same skill sets.
This would keep things simple, for sure.