As adoptive parents sometimes when we see a glimmer of progress it is often combined with a feeling of sadness. It is an odd feeling to be sad when you should be happy. The reason for this is often the signs of progress are things which other children never have to face, things which never even cross their minds as being an issue, yet can be absolutely massive steps forward for our children. This could be something as simple as reacting in a shy way to a stranger where they would normally go up and give them a huge hug.
