C.B.
Baby wearing will make a huge difference! Sling, pouch, wrap, whatever-but when the baby is on you, she'll back off. Big sisters tend to want to be little mommies, and at that age aren't really understanding much about how gentle you need to be. It doesn't sound to me like a jealousy issue, more of a fascination issue. Like someone else mentioned, it will pass with time. Wearing him help, but for the times when you're not wearing him, take time to help her hold him and let her help with him (fetching diapers, talking to him to help keep him happy, etc) so that she feels like she has an active role to do. Sometimes once they have been given a role, they stop trying to create one by wanting to be practically on top of baby 24/7.