My niece slapped my 20 days old babygirl will it cause any harm

A. Now it would completely depend how old your niece is and how hard or with what intensity has a child slapped your child that would completely depend on that and how much as your child cried because sometimes a small child does this then the hand has no intensity or power so it doesn’t affect but sometimes a child is older maybe three or four years or five years and they intentionally do it very hard then it can create a problem of Just pain and irritation to the child and sometimes it can actually affect the particular place where the child has been hit as the face skin is very sensitive