My daughter is on nestle good start and it varies from green to sometimes its yellow with those fatty curds that breastfed babies get
As long as they are not hard little balls and she's not constipated (which my son who is now 5 yrs and my daughter who is 2mnths) never had .. having been on good start.
I often hear about other babies on similac and such that are always gassy and constipated. Good Start seems to alleviate those problems..