So you can’t just trust that they’re going to obey your every command. Some baby proofing is necessary, in my opinion. How you baby proof your house, how much you baby proof, and when is ultimately up to you.
I think that it really depends on the baby! I personally think that as soon as your baby is mobile, you should take the necessary precautions to keep baby safe – EVEN if it’s just rolling.
ALSO, for “general baby proofing” if you have a TODDLER and baby, or a PET and a baby, you will want a pack and play. I didn’t have a playpen with my first, but before he was mobile there was no real danger to him when he was laying on the floor.