My 18 month old DD keeps smacking me and my friends children . She is my only child and I dont know what to do. She doesnt hurt. It just seems to be something she does to get attention. I get down to her level and say "no. no hitting" but she just laughs at me (even with my sternest voice!). One of my friends suggested putting her in her cot every time she does it so she understands not to do it. I thought she is a but young for this. Any suggestions?