we live in Switzerland. ds1 started KG with v. little German. He spoke v. little 1st year. Got v. sad report saying he didn't mix, rarely spoke, would sit in corner with back to others. I knew it was a language issue, as when we went to UK he was really pleased to talk to strange kids, adults, anyone who'd listen!!! Then in the summer holiday, something just clicked and his 2nd year was so different. It was unbelievable.
Then ds2 started kg 1 year later, so the brothers were reunited for a year, with a reasonaböle but still rather limited amount of German. Again, 1st year, very little interaction with the other kids , mirror image of his brother really, although they were in the same (one and only class) they were kept apart as much as possible, but he still didin't speak much.
Then again, 2nd year, total transformation, a bit less 'overnight' than his brother.
So going by my experience with 2 ds's , we had rocky 1st year both times & fab 2nd year both times. Thank goodness for the slow & gentle start, so all this is happening when they're at kg not school.
Ds2 is getting speech therapy too, but in German.
Does the teacher speak to him in Enfglish or German? Does his have much contact with local kids outside of KG (invaluable)
Don't like the sound of teacher saying he 'must' speak, how is she normally, our kg teacher was fab and she worked very hard to give him as much attention & even 1 to 1 as possible and was extremely gentle and encouragiing with him, really boosted him, saying he must give the image of a stern dominatrix wagging her finger and telling him to talk now. Hope it isn't like that.
ps we also spek english at home, but the boys have loads of contact with the swiss kids, always out playing. I'd say they are bilingual now, after 3 years