Being a parent seems to be an exercise in excessive worrying. I spent my entire pregnancy worrying about my baby's development, only realize that once my son was born the incessant worrying had only just begun. We baby proofed our home, buying stair gates way before he was capable of walking and outlet covers way before he could crawl. So before I knew it, a whole new host of normal household products that terrify me were a relentless thorn in my side. You guys, there's danger all around us.
Of course, it goes without saying (but I'm going to "say" it anyway) that you're first step should always be to put any harmful products — like, cleaners, bleach, and detergents — in a space away from little and curious hands, preferably up high or in a child proofed cupboard or drawer. I, personally, think the perfect time to start baby proofing your home is before your baby is mobile enough to get into any actual trouble. Of course, it's necessary to periodically reassess the safety of your home as your child becomes more able and active.
Toddlers, like mine, are particularly inventive when it comes to getting into trouble. We once caught my son inspecting the knives in the open dishwasher. I had gone to the bathroom (quickly, might I add) and with the door open, only to find he had dragged a dining room chair over to the baby gate separating the dining room and kitchen, scaled his way over into the out-of-bounds kitchen. Thankfully I got there just in time, but ugh, kid. I don't need a heart attack, thank you very much.