S.
Some friends of ours had this problem and they ended up getting a "pet-gate" at Petsmart or somewhere, for WAY LESS than the usual over-priced babygates. It's an adjustable-width, expandable kinda deal that you can move around (wood frame with coated wire mesh in the middle)- you don't have to install it anywhere permanently. We are going to look for one ourselves. They are designed to hold large dogs back so it should work for babies. ;)