seventh generation 'baby' when newborn (separated for first 3 months or so) and now the regular version (all family's clothes washed together). it's fragrance + phosphate free, hypoallergenic etc. Stocked at health food stores, 360, B2B and City super.
Personally, I have found that detergent can be a factor if you are prone to rashes or have skin conditions. There can be chemical residue irrespective of how much clothes are rinsed.