I was born in the early seventies.
As far as we were concerned, sun cream came in number 2 (for my parents) and number 4 (for me). I was very pale skinned and freckly and number 4 did nothing for me. We had a disastrous holiday in the Caribbean when I was about 5 and I burned horribly. DM thought she was being very cautious by using number 4 on me. :(
I was left in hotel rooms as a baby and small child when my DP went for a walk on the beach or out for a meal. They still don't see anything wrong with this.
No seat belts in the car until it was made compulsory. Actually, DF made me wear one. DM didn't believe in them and still doesn't. She thinks it's a lot of over reaction. We had huge arguments about strapping my DC in car seats, as she really didn't think it was necessary.
My DP ran their own business, and I was left in my playpen as a baby for hours while they worked. My DM popped through now and then to make sure I was ok. The front door was open to clients, and anyone really who wanted to come in, and the front door and waiting room were in-between the room where my parents worked, so they couldn't hear me or tell if anyone came into the room. 
I don't think my DM gave up alcohol when she was pregnant, but they were both very anti-smoking, and I don't think I smelled cigarette smoke until I was about 10!