Infant homicide is often perpetrated at birth by young mothers (who are found at a party hours later). Another common homicide scenario is fatal child abuse by a boyfriend. I am referring to the latter. The data below show that the live in boyfriend is a mortal threat to young children:
Relative Risk of Fatal Child Abuse:
Household composition:
One biological parent only 1.2 (0.8-2.0)
Other relative present 2.5 (1.3-4.9)
Step, other parent present 5.0 (2.1-12.0)
Other, unrelated adult present 10.3 (4.9-21.9)
Two biological parents Reference[they had to use a reference, because it is so rare their were none in their statewide sample].
Household composition and risk of fatal child maltreatment. Pediatrics, April, 2002,