Even though my daughter was a newborn when we adopted her, I wanted to add my 2 cents.
My neighbor's daughter adopted a baby boy & baby girl from Russia (at different times). Both babies were 12 months old at time of adoption. She had absolutely no problems with either of them.
I have met and interracted with both babies. They are unbelievably healthy, happy, beautiful and ATTATCHED to mommy.
My co-worker's son was also adopted from Russia. He was 18 months at the time. I have also met this gorgeous little boy. Again- no attachment problems or anything of the like.
Maybe they both got lucky? I don't know. I believe that if you are going the international route, you need to make sure that the babies were receving either good foster care or and or in loving hands.
Best of luck,
Julie