In my opinion, it is really too cruel for a young baby to go to school. They will have some pressure in some degree. So my daughter will go to K1 directly this August.
However, if you have no one to help looking after your boy, it might be needed. :( Perhaps kids can get used to the new environment easily.
My son reached 2 years old on Feb. and i send him to N1 on March even though I have a maid and my mother to look after him.
My reason is
1. They spoil my son
2. They don't know how to teach him talks, they would give him whatever he wants when he points to or cries for something(my son speaks only a few words till 2 yesrs old, but now improve a lots)
3. They can't follow my instruction for the toilet training (the school trains him right now)
I think you may feel bad in the first week, seeing he cries when saying goodbye, but now my son loves to go to school.
我把平安留給你們,我將我的平安賜給你們;我所賜給你們的,不像世界所賜的一樣。你心裏不要煩亂,也不要膽怯。(若 14:27) Happy moments, praise God. Difficult moments, seek God. Quiet moments, worship God. Painful moments, trust God. Every moment, thank God!!!