I Wash my toddler laundry daily because its smell awful due to dampness and food particle... But I will like to do alternate days because it's more economical... Do you suggest I soak his clothe and wash once every 2 days ?

Personal preference. For food particle I will rinse immediately by hand then hang to dry then later put in laundry basket. U don't put damp stuff into the clothes basket. it's going to make everything damp and will smell. I was every few days