Our son was 18 months and we hadn't used the word with him. Just redirecting him when necessary. My husband's 24 yo sister came to stay with us and he learned "NO" and "MINE!" from her in less than 24 hours. I was mad enough to spit!
On the funny side, a good friend of mine's daughter calls her grandma "NoNo" rather than grandma because her grandma says "no no no no" everytime one of the kids does anything more than stand upright.
On the funny side, a good friend of mine's daughter calls her grandma "NoNo" rather than grandma because her grandma says "no no no no" everytime one of the kids does anything more than stand upright.






