At What Age Should You Start To Discipline Your Child?

Curious to know what everyone thinks. My friends gotta 1 yr old and @ 9 months they introduced "NO". I have a 2 1/2 yr old an she knows what "NO" means but from time to time decides she doesn't want to listen so i've been working on this time-out thing where if she doesn't listen i... show more Curious to know what everyone thinks. My friends gotta 1 yr old and @ 9 months they introduced "NO". I have a 2 1/2 yr old an she knows what "NO" means but from time to time decides she doesn't want to listen so i've been working on this time-out thing where if she doesn't listen i will put her in her crib for a certain amount of time depending of the seriousness of what she's done wrong. My neighbor who also has a 2 yr old thinks that i'm nuts for the time-out thing an that a good ol' spanking will do the trick...juss curious to hear some other opinions from you guys an hear what you've found thats worked an what doesn't work
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