I also have two kids (4yr and 2yr).
It was hard when small b was under 1.
After big b went to full time kindy, it was not bad.
Now they are good playmates so I feel quite easy as long as both of them are healthy.
It was very hard when they were sick.
I m very very glad that I decided to have small b and became a full time mum.
My big b (now a big boy) is so so much happier.