I agree, whomever notices the diaper needs changing will take care of it. Tech, secretary, nurse, cna...its usually a team effort unless that person is super busy with their own stuff at that moment- then they would just tell the nurse.
If it something where we are weighing diapers, or collecting stool then they may let the pts nurse know so she can do whatever was ordered.
at many hospitals the babies are checked out and "admitted" to the hospital by the NAN (Newborn Admitted Nurse). S/he checks the babies out from head to toe and gives them their Hep B and Vit K if the parents agree. As far as feedings and changes that is usually done by the parents or whatever member of the staff that notices that there is a need.