My 4 1/2 month old son just cut his first two teeth yesterday. He s been running a low grade fever (99-101) but I took him to the er today because he was kind of glassy eyed and lathargic. He was diagnosed with an ear infection and prescribed amoxicillin. He s had one dose. When he woke from his nap after the dose and a bottle, his eye was crusted over. I called the ER and was told it was all part of the infection - should clear within 72 hours. My question is after his nightime bottle, he projectile vomitted the entire thing. He s now sleeping, but I know he ll wake up in the middle of the night hungry! Should I be concerned about a reaction to the antibiotic? Or could it be that he just doesn t feel good?