I was adopted at 6 weeks, was in foster care from birth. I can't ever remember NOT knowing that my brother and I were adopted. The hardest part has been having very little info about my birthparents. That seems to vary from adoptee to adoptee - my brother (different birthparents) seems outwardly to care very little about them. I went through a state mediator to locate my birthmother, who (once again) rejected me - OUCH! I think the best thing to do is to make sure your adopted kids know where they came from and how happy you are that they are a part of your life.