That is a shame. I am so sorry for you. Things like this happen sometimes. There is a possibility that it was the medicated feed. Just FYI. Some birds are more subsceptible to it than others. You just never know. On the other hand, maybe the mom dumped them because there was something...
Hey! Congrats on your new babies! The main thing is to keep them warm. A heat lamp works best, but for now a simple light bulb will work. Keep it in a corner of the box, so they can move if it gets too hot. Make sure they have access to fresh water, in a shallow dish. They will probably...