Are all Bouncers the same do you have diffrent ones for diffrent ages or can you use them all for newborns?

My Bjorn bouncer (a href="http://www.babybecause.com/Shop/Control/Product/fp/SFV/32239/vpid/3151124/vpcsid/0/rid/125321)" rel="nofollow"http://www.babybecause.com/Shop/Control/…/a said 8 pounds+ on the box, and I think it requires a little bit of head control in the upright position. However, it does recline and I think that would be ok for a newborn. I also have a Fisher Price rocker (a href="http://www.toysrus.com/product/index.jsp?productId=2508004)," rel="nofollow"http://www.toysrus.com/product/index.jsp…/a and that one would probably be ok for a newborn too because it can recline. It also has battery vibration, which is nice. The Bjorn needsto be pushed or the baby has to kick to get it to bounce. I didn't really use either until he was about 1 month, because I was holding him all of the time.