I had a black snake get into a cage and try eating baby ducks that were to large for them. when I caught the snake it was on it's third duckling head first, down to the chest, suffocated it, spit it out and tried another, they were wet, but not prolapsed , probably due to not being able to swallow it all. Another had gotten into pen and had consumed some small chicks, it regurgitated the last 2 it had eaten to try to get away from me. still had a couple more further down that didn't come up. Needless to say, the snakes never had another meal. I am so sad for you and the babies.