I did an eval on a little girl (18 mos or so) recently who had had tubes placed recently and began walking, babbling, playing with other kids, sleeping through the night.... just making all these developmental gains. Her mom thought the chronic effusion was affecting her balance and demeanor as well as her hearing. Aidan's gains weren't quite as dramatic , but they were immediate and noticeable (e.g. he slept through the night for the first time since he was tiny). I hope you have good results.