R.P.
I have 3 kids, 6, 4 in a couple of weeks and almost 19 months. All girls. I didn't experience any problems with jealousy in the oldest two when my youngest was born. My oldest was like a little mom to her. She wanted to feed her and hold her and everything. My middle one (she was just 28 months when the youngest was born) was kinda indifferent. She wasn't jealous, but it was more "hi baby" and that was about it. Once the baby got older, she played with her more.