My ds (4) has just started swimming lessons with a new swimming school and we are 2 lessons in.
The first lesson I noticed it seemed to be quite a big class he was in, with most of the other children able to swim to a higher level than my ds. There are 4 classes going on at the same time in the same pool with numerous teachers at different ends of the pool.
Anyway this week on his second lesson they were using pool noodles which ds has used a couple of times but this time he was put onto his back. He is unsteady on his back. He can't swim unaided at all. He ended up struggling and losing his grip, went under the water and couldn't get back up. I've no idea how long he was under as it always seems an eternity, but was horrified that the swim teacher hadn't noticed and was in the middle of the pool with some of that other kids. There was her and a young teenage girl helping at that lesson. Neither of them could see him. He was in the shallow end but this still comes above his head so he couldn't just put his feet down.
I ended up running across the poolside with my baby in my arms screaming to the nearest teacher I could get to that he was under. By this time the teacher had seen me yelling and got to him just after me. She pulled him out. He was OK it happened quite fast but I'm really really concerned now because if I hadn't been watching him they wouldn't have known. They gave no apology or explanation.
My son is fine and it hasn't knocked his confidence. My question is should I complain and if so how? I'm useless at making a complaint 
and I always end up making myself somehow sound like I'm being unreasonable or being almost apologetic. I want to let them know they need to keep a closer eye on him as a non swimmer and I'm unhappy about what happened.
Or on the other side of it am I overreacting? Does this stuff just happen and should I just forget it and worry if it happens again? No idea what's OK and not OK really.