5 doctors weighed in:
When will my child comprehend "no?"
5 doctors weighed in

Dr. Michael Amster
Pediatrics
3 doctors agree
In brief: Around 12-15 months
Children understand a "menacing tone" around 12 months or so, and that followed by a removal of your attention is generally enough to engender behavior modification.
The word "no" is a good word as it is short, and an easy one to remember but it was the tone, and the method it was given that was important. Saying "no honey..." in a sing-song voice is just as effective as giving him candy.

In brief: Around 12-15 months
Children understand a "menacing tone" around 12 months or so, and that followed by a removal of your attention is generally enough to engender behavior modification.
The word "no" is a good word as it is short, and an easy one to remember but it was the tone, and the method it was given that was important. Saying "no honey..." in a sing-song voice is just as effective as giving him candy.
Dr. Michael Amster
Dr. Michael Amster
Thank
Dr. Richard Pollard
Anesthesiology
In brief: Tough call
Raising children is an art form, not a science.
I can tell you from personal experience that 15 year olds sometimes do not understand the word "no". The best choice is repetition and vigilance. Good luck.

In brief: Tough call
Raising children is an art form, not a science.
I can tell you from personal experience that 15 year olds sometimes do not understand the word "no". The best choice is repetition and vigilance. Good luck.
Dr. Richard Pollard
Dr. Richard Pollard
Thank
Read more answers from doctors