Thrush?

When DS2's teacher called today to let me know what his probably lunchtime would be, she said that they think he has thrush. Since he doesn't handle and mouth toys yet, all they need to do is rinse his bottle and return them (instead of washing in the sink with all of the other kids' bottles). I will start sterilizing the nipples (and probably bottles) every evening. One thing I didn't know is that it makes the baby's mouth hurt. That might be why he cried when I gave him the decongestant, or maybe he just didn't like the taste. I didn't notice any white in his mouth or bottem lip, as the teacher described, but maybe I just missed. It does probably mean yet another trip to the doctor's office. If it really is thrush, then I will be glad they caught it, but it sure seems like they want a doctor to look at every little thing.