I hate it when vets say "they're too young for antibiotics"! It's a damned if you do, and damned if you don't situation, and I don't hesitate to use a small amount of Amoxi mixed into formula for sick babies. The alternative is let them get worse until it turns fatal, so I'll go with antibiotics any day! I'm so happy Annie stayed home, and your vet prescribed meds for the tiny baby. I'd definately keep Shadow wayyyy away from her, and wash your hands thoroughly after handling Annie. Those URI's are very contagious, and right now I'm sure you don't want two sick kittens on your hands. Give that baby doll a kiss for me please. Keep us posted.