S.G.
Hi M.,
I have a four month old baby girl and a 21/2 year old big girl. We were in the same boat. My oldest is always smothering the baby, "feeding her", kissing her, hugging her, "teaching her" and "playing with her"! Although precious, everyone needs space. The only thing that has worked for us is to put into place the "alone time blankie". We explained to my daughter that everyone, including her and the baby needed alone time. We picked a special blanket and told her that when the baby was on the blanket she had to stay off it. The blanket is big enough that the baby can roll around, squirm and be free from sissy for a while. This works well because my oldest daughter understands this boundry, and is happy she can still see and interact with the baby. As the baby has gotten bigger, we use the blanket less and less, but still use it for tummy time or when the oldest is really going after the baby. I use it for about thirty minutes at a time. Long enough to give the baby a break and settle down the oldest.
We had tried the pack n play, but the baby didn't care for it. We tried the bouncy, but my oldest loves bouncing baby. We tried the swing, same thing. We tried putting them in seperate rooms, that ovbiously didn't work! For us this has been a life saver. My oldest daughter doesn't feel like she has done something wrong when the blanket comes out (and she shouldn't because she just loves baby), she can still see and interact with the baby, and the baby gets a break.
Good luck!