I agree with “over40mom”. The sooner you make it part of who they are, the more natural it is. My boys, ages 5 and 3, respectively, were biologically born in Guatemala, and they both know that, but they also know they were both born in my heart. They don’t have any concept of our family being able to be made any differently than it is. They know they were both born in someone else’s “tummy”, but were born in my heart as their mother. Neither of them really seem to think that it’s unusual—it’s just who we are and how God made our family. Our oldest once asked the name of the lady who gave birth to him, and I told him, but he seemed completely unphased by it. Time will tell, but we have always made sure we were as open as we could be with our boys in loving them for who they are, and making sure they know that they were always planned by God to be our sons…it just didn’t happen the way it does for many families.