My son (now 24) was on antibiotics probably 7 or 8 times (or more) from April to January when he was just an infant.... he ended up with MANY ear infections (and repeat antibiotics), and even ended up with ear infections while he was ON antibiotics.....
If they are needed, they are needed. He is now 24, 6 ft tall, and I don't think he was negatively impacted by them...... on the other hand, if he hadn't had the antibiotics, he might have ended up with much more serious ear problems. (He had tubes put in when he was 13 months old... and still got ear infections.)
I realize it may seem extreme for him to be on antibiotics 4 times, but if the doctor thinks it is best, why do parents constantly question a doctor's wisdom and experience? Do you have the medical training to know whether a child needs antibiotics?
I would much rather trust the doctor's experience and knowledge than random people on the internet......