I would defiently legally protect yourself and your kids. That is a given, but you don't have to push her away while doing it. No matter what she will always be the mother of these kids, and making it bitter, only hurts them in the long run.
Take a few deep breaths and let things lay as they are. Use the 48 hour rule, no drastic decision making for 48 hours. I would defiently call W and tell her your taking or took the 5 month old to the hospital. Boy or girl?
