Sounds like my nephew who 18 months old. He's the worst with his mother (my sis-in-law) just laughs it off. She's expecting #2 in a few weeks and he's been like thig to my daughter and their family dog. He bites the poor dog!!

I told her the same thing....not to use a high chair as you don't want to associate eating time with punishment but to use the playpen. In plain view and keep putting him in there at every "wrong". Enough is enough and God forbid he really hhurts the baby!