I agree with the others - couldn't the baby crawl thru too?
Drs Foster & Smith had some like this on their web site... but it's mostly for small pets / cats to get thru while keeping larger ones behind the gate (the small door shuts too): http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=18111
Charlotte on Aug 13 at 11:18 AM