Hi Pelafina
I have 6 now, all different!
The ergo is just utterly wonderful and I think the best so far for me, but my baby is now 6 months and 21 lbs so he is a bit bigger than yours. It is amazing how having him on my back he feels so much lighter - he loves it and so do I as I can get so much done (have 2 hands free and can bend down easily), apart from when he pulls my hair to amuse himself!
Sorry to tempt you into another one!!