DD had a pretty severe labial adhesion - it was all the way fused all the way up to a very small hole for her pee to come out, poor girl! If it's not that thick of an adhesion, then you can try rubbing olive oil on it at every diaper changed, pressing firmly to try and open it yourself - the olive oil will help it from adhering more. If it's a thicker adhesion (like you can't see where the labia has adhered - it will just look like skin with no line) then you can always ask your doc to prescribe some estrogen cream. I tried the olive oil, but my DD's was pretty thick and it didn't work on hers. It did however work for her cousin who had one that was less severe. I ended up asking for the estrogen cream because she was constantly smelling like woman (for lack of a better term) and I was afraid that she would inadvertantly come down with a UTI or yeast infection from getting bacteria trapped. The doc prescribed once a day for 7 days, but at 7 days, it looked a little better, and I had read it could take up to 2 weeks, so I continued it and at 10 days, it unadhered on its own. Apparently little girls don't start making that much estrogen until 3-5 years old, so it is a temporary thing that will eventually go away usually if you would prefer not do to anything about it.
Hope that helps!
Rachel, wifey to (3/06), tandem nursing mama to(7/08) & (4/11) and missing (7/09, 2/10, 7/10)