my baby is 8 months ols and he is teething, for the last 3 days he has a temperature between 38.5 and 39.8 degrees, I took him to the doc and he prescribed ponstan and an antibiotic with amoxillyn, baby cant seem to keep the antibiotic down , after just a few drops he has projectile vomiting emptying the contents of his tummy , does this mean that he is allergic to the amoxillyn ? i cant finish the course because of this