I know that I am extremely late coming to this tread but I wanted to put in my two-cents and to share some thoughts on karma that have brought me comfort since losing my son just over 3 months ago. (Ellis was born, perfect, at 39 weeks and stopped breathing 32 hours later, we do not know why and do not expect to ever get a medical explanation.)
In the first week after our loss my prenatal yoga teacher came to check on me. She shared the following: In the Hindu tradition, the belief is that you are born over and over again until you have burned off enough of your accumulated bad karma to reach enlightenment. Once that happens you become one with universe and never need to be reborn again. When a baby is born, and dies so quickly, it is because they only needed one more short life to burn that last bit bad karma so they could reach enlightenment.
I would like to believe that that is what happened with my Ellis. That he was a nearly perfect soul and only needed a short time on Earth before he could become one with the universe. He chose me to give him that life. He died, not because of my bad karma, but because his was so good.