Parents of biracial children.

Hi guys. I need some advice from parents who have biracial kids. Me and my husband are expecting our first child in March and either of us have any other children from previous relationships. I am a full blooded Native American and my husband is white. While our hearts don't see race, I know that there are others whose hearts do. Even before we were married, still dating, we faced backlash for choosing outside our race by some people. We, as adults, can handle it. Children are a different matter. My worry as a parent is that our son will be teased, bullied, perhaps even harmed as a result of his "mixed heritage", especially when he becomes old enough to attend school, we all know that children can be quite mean. How can I help my son once he becomes old enough to understand? We want to make sure that his heritage, both Native and white, is something he should be proud and and ensure that he will never have to feel ashamed about who he is and who his family is. I also worry that there will be parents who will not want their children playing with my son because "he doesn't look like them". What explanation could we offer him about why his friends can't play with him? I know these things may be years ahead of us in time but could anyone help quell a parent's fear? Thanks in advance.