So, long story short, my husband and I had fertility issues and thought we could not get pregnant so we adopted a baby boy last year.  He just turned a year old on the 10th. We found out when he was 6 months old that we are pregnant with his little sister. We are beyond excited!!!  My husband and I both have wanted several children and after trying for 8 years, this is truly a blessing from the Lord.  My question is, how do you explain to your 1 year old that he is going to be a big brother?  We talk to him about the baby, but he shows no interest in sharing or having a younger sibling......