My son was born in Thailand in 2015 and has lived here all his life (he's a UK citizen). Every year his Extension of Stay has been extended, as my dependant (I have a work Extension). I have never done a 90-day report for him and this has never been questioned at Immigration when processing his extension. For the first time, last year, it was. I just shrugged my shoulders and said I thought he didn't need to do one as he's a child. They seemed to accept that and his Extension was granted.
So, when should a child start doing 90-day reports? Children can't be fined, so if I do his first one now, will a fine be levied?