Answer:
Length of labor
Step-by-step explanation:
When a person is infected with a pathogen, there is a high probability the pathogen entered the body through a bodily opening, either the mouth, nose, etc. A pathogen is also able to enter the body through a cut. Since labor is long (17 hours) and the cervix is dilated, there is a risk for infection.
The Rh status, weight and size of the baby, and type of birth (vaginal or cesarean) do not normally influence the risk for infection to the baby or the mother.