DS is 13 months old and besides a few play dates, hasn't had a huge amount of interaction with any other kids. Tonight we were baby sitting a friends 11 month old DD. Whenever she picked something up or came near either DH or myself he would climb on her, snatch things off her, hit her and pull her hair. It seemed very much like a jealousy response, like a 'that's MY dad' thing. I'm almost 34 weeks pregnant and I'm worried he will react this way when his brother arrives! Do you think 'sharing' us is something he will get use to? What could I try to discourage this behavior?