I happily and successfully take care of 4 infants. Have for over 24 years. It comes very easily to me. I have time to read, study and do preschool with the oldest during morning nap. I currently have 5 kids 1 year and under and a preschooler. Just another day at the office.
I think 6 total is a silly low ratio.
Lowering ratios will only make childcare even more expensive and elusive.