Ears and Antibiotics!

I'm a little frustrated so bear with me, while i vent. Porter had his first ear infection at 6weeks, which is a little young to have them , but has had 5 ear infections since then...that's right i said 5 and he's only 9months old. Ear infections are normally caused by something else and between teething and asthma he tends to get congested easily....which leads to the ear infections. So we took him in last week and he has yet another ear infection (the last one never cleared up) so his Pediatrician put him on a completely different antibiotic, and it seems to be working, but it frustrating to seem him suffer so often. He's normally such a happy baby. If his ears haven't cleared up at his next check-up we are going to ask for a referral to an ear-nose-throat spec.