What do you do when your toddler (mine is 13 months) thinks that when you say 'no' it means put a cheeky grin on your face and do it again and again. At the moment we are removing him from whatever the problem is and distracting. But he then goes back to doing it again later.
Im having the same thing with my 13 month old, Im just saying no and removing, the 1st "no" i say in a soft tone then get more hard if i have to repeat which is always and is now starting to get a tantrum as a result. He does understand tho because i see him glance at me when he decides he going to try and touch it again. Broken record springs to mind lol x
He's a bit young. Save "no" for when it really matters. Plus it's all in the tone of voice not the word itself. Toddlers are impulsive and find it difficult to control their urges - and they will keep doing the same thing over and over to see if the same rule applies.
If you don't want them to touch it at this age, hide it. As they get a bit older you can teach them more easily but at that age it's a losing battle.
You have to 'be' no rather than just saying it. Tone of voice, expression in your face, stance, eyes... the whole nine yards A lot of the naughty stuff they do that age is pretty funny so when you say it you can't afford to be ambiguous.
I agree with Angel too - we restrict 'NO' to things that are actually dangerous. If it's just something I'd prefer he didn't do we either compromise - as in "you can tip all the chalks on the floor but then we're going to pick them all up again" or I take whatever it is away and put it out of reach/ distract him. If it's simple mess-creation then it can be best to let them get on with it. Taking stuff out of the kitchen cupboards drives one of my friends crazy - as a result it's remained Top Fun Activity for her toddler for about eight months and counting.