The advice for SM treatment is NOT to speak for the child if possible, and instead to implement a slew of methods from a young age before the SM becomes entrenched. Can I ask what age you overcame the SM?
Please, everyone on this thread, familiarise yourself with Selective Mutism. The SMIRA web site is a good resource, but there are others if you google. SM is a neurological difference in the same way as dyslexia, adhd and autism. It affects approx 1 in 140 children, yet there is a complete lack of awareness of this condition, with friends and family deeming the child rude at worst or shy at best. It isn’t due to bad parenting or bad character - it’s a true difference in the brain!
The difficulty for parents is that the child will talk quite typically at home and if it’s ’low level’ the child will also talk typically with same age familiar children at primary school. Parents can be quite unaware of how bad things are. It needs a clued up teacher to point out that the child can only whisper or use other forms of communication with adults at the school (nodding/shake of head).
It would also be great if parent’s friends, extended family and any adult the child comes into contact with, could politely point out that there is a condition called Selective Mutism that they could take a look at, with a treatment protocol to follow. What we don’t want is for these children to be missed and enter Year 4 and above having received no treatment. The prognosis at high school can be absolutely horrendous - school refusal, depression, generalised anxiety etc.
Can I also just say, for parents of SM children, the look of disgust and judgement that is received when our children can’t reach societal expectations of confidence and good manners (no matter the sheer amount of work we’ve put in behind the scenes over many years) is absolutely devastating for us. If 1 in 140 children have SM, I am certain many on this thread have encountered an SM child. Please try to be aware of differences and educate yourself about them.