I need help

I want S to grow up knowing he is adopted. I just want it to be a part of who he is so he never has to question or wonder.

My problem is, how do I tell him?! Do I just start from day one saying, "You are adopted." And when he's old enough he can ask me what adopted means? Or do I tell him, "Your birth mom emailed today..." or "You are special because mommy couldn't hold you in her tummy, so someone else did." Or, "You were meant to be part of our family, you just came a different way than most people." ?

My son is almost a year old, and at this point he understands a lot of what I say, but I think this might go over his head. But for how long? I try to tell him, but my words always make me sound like I'm reading a sentence backwards. They just make no sense.

So I need help, advice, experiences. What did you say? When did you start saying it? When did your child understand you? And how did they take it?

Please help me.