Week 3 in school

This is already Caden's 3rd week in school... and the situation seems to worsen.. he is still crying on the way to school, pukes in the morning as my MIL left him... cried from 1130 onwards as he is aware that it is time to go back home... Teacher wanted to talk to us this week but she didnt have a chance to call me.. I wonder how much longer he needs to settle down.. today, he had lost his voice slightly, my MIL said that its becos of prolong crying.. it is heartbreaking to see him like this.. but we can't possibly pull out and stop school.. if it happens to him this way again in N1, N2, does it then mean he doesn't need to go K1? so we decided to be slightly stone-hearted to monitor Caden's condition in the next 3 weeks..