The baby at a movie is an issue more due to audience disruption than "scarring" the kid,
An actual baby won't be impacted by the violence in "Wick". He/she might get upset with all the loud noises, but the movie's graphic content won't be an issue until he/she is a couple years older.
For...
Summary of "Parabellum":
-Ultra-violent action scene
-Exposition about rules and regulations among killers
-Another ultra-violent action scene
-More exposition about rules and regulations
-Lather, rinse
Did I forget anything?