Fortified human milk can be used for 24 hrs post fortifier added.
Ref: 
Jocson MAL, Mason EO, Shanler RJ. The Effects of Nutrient Fortification and 
Varying Storage Conditions on Host Defense Properties of Human Milk. Pediatrics 
1997; 100(2):240-243

Nancy E. Wight MD, IBCLC, FABM, FAAP
Neonatologist
Medical Director, Lactation Services
Sharp Mary Birch Hospital for Women
San Diego, CA USA
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