Baby is 9 and a half months now and crawling into all sorts of mischief. Obviously we have removed lots of hazards from reach, but unfortunately due to gravity the floor can't be completely cleared. I've read that babies at this age understand the word "no", but when I use it with my best mum voice he just stops, looks at me, and does the thing again. We've been following this pattern for a few weeks and he doesn't seem to get it.
What have your experiences been? Is there a better way to teach them "no"?