No you did all you could do. And then some. I look at it this way.....if they pas then it wasn't meant to be, but I know I've done everything I could to help. Every time I go check on my Tia I hold my breath, hoping she's ok. You just never know.
Also what we don't know is there could have been more wrong with him other than the cleft. It could be a possibility. I'm here for you. Take care and please remember you did all you could, and more. He was lucky to have you