Re: How many did or did Not get rashes or burn from Nellie's or Eco Sprout detergent?
The Laundry Tarts is the only detergent I've tried that has made DD turn pink all over her diaper area. I've had luck with Nellies.
My favourite detergent, though, is Sunlight Sensitive. I get the feeling you're looking for something more 'natural', but seriously, Sunlight Sensitive is the best detergent I've used for my diapers...and it doesn't have any scents. I'm sensitive to detergents, and this one has been great for the whole family.