80's - age of safety
I didn't realize until watching this years later. At the end of the movie when Holly and Sam are driving Sandy and Steven home from the hospital, nobody is wearing their seatbelt (you can see Sam and Holly's undone above the seat) and Sandy is holding her infant in her lap.
Nowadays, seatbelts strap you in automatically like a spider web or that metal statue of liberty scene from X-Men. Your car "yells" at you if you forget to strap in. Infants have to be in a composite-plastic trap in the middle of the back seat at a precise, obtuse angle with a DOT approved chair that doesn't allow for mobiles or play toys or the slight movement of their head.