Prayers for my newborn please

My sister came to visit with her 15 mo old right after I had my daughter a week ago. Monday, my son caught hand foot and mouth somewhere and 4 days later now, her daughter is sick. We have all been in close contact in our small home and I really wish she hadn't come the week I had her. Trying our best to isolate them and wash our hands plus giving her my pumped milk since she won't latch. Prayers needed my daughter doesn't get sick too as she's a newborn and I would have to take her to the e.r. I'm really stressed. 😓