At what age did your baby understand what the word "No" means? - baby walker safety

Approximately 2 weeks when my daughter was a few days to 8 months, grabbed me by the game with the outlet, while the safety of her walker. I said, "Alyssa," No, ma'am "in a stern voice. Now, I), look, look down (with a smile, and away from the wall. And since then, when I say" No "or" Alyssa Grace not) screaming, 'No, ma'am "in a severe tone (" doing what he does or intends to do. Sometimes she laughs and goes about his business, and sometimes riot for a second skin (like she knows something that he wrong). What happens to your baby?