Hospital laundries are horror on dark fabrics and black and dark brown would be the worst I think as they would bleed and fade quickly leaving a fabric that looked "dirty" all the time. Being a Nurse also and a Mom, I would not want my baby wrapped up in something dark. Patients in general do much better in light with bright or with pastels in their surroundings and these tend to lean toward healing. Darks do not seem to do that. Just my humble opinion.