I just hate violence against babies and children - particulalry if it's not really necessary for the narrative.
That's why I can accept those scenes in "Inside" (not a real baby to begin with) and "Rambo" (a necessary taboo breaker in mainstream Hollywood action terms to confront an unsuspecting audience with the real cruelty of war), but truly LOATHE the "baby scenes" in Uwe Boll's "Seed" and "Murder Set Pieces".
Having a family of your own will ultimately have an effect on your sensibilities.