Just to share my experience. This month I started 2nd old DD on full day child care. 1st day, she went half day n 2nd day onwards, she is already on full day and comes home in the school bus with my 6 yr old DS. She cried for a week but now tells me she is a happy girl. The things they learn in school is definitely much more than staying at home. Based on experience, going to a non-aircon school reduces the rate of falling sick. 6 years ago when DS1 went to an zircon child care centre, he kept falling sick until I gave up and moved him to a non-aircon one.