With regard to the recent discussion about mixing mothersmilk with formula. I had a look at this topic for someone else a few days ago and found many references relating to fortification of human milk for preterm or LBW infants. Although this situation is different from mixing formual with human milk there might be some parallels, especially relating to the osmolarity and the effect of human milk amylase on the formula. Hope this can be some help to someone? Of course the advice given by Pat Gima is the most obvious ("But I do recommend that mom give baby the breastmilk separate from the formula because of waste of the great stuff if baby doesn't drink all of the bottle.") Sara Bernard The Netherlands Effect of fortification on the osmolality of human milk http://adc.bmjjournals.com/cgi/content/full/fetalneonatal%3b81/2/F141 Pediatrics 1997 Aug;100(2 Pt 1):240-3 The effects of nutrient fortification and varying storage conditions on host defense properties of human milk. Jocson MA, Mason EO, Schanler RJ. USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, and Texas Children's Hospital, Houston, Texas 77030, USA. OBJECTIVE: Data are scarce regarding the effects of nutrient fortification and storage on the immunoprotective properties of human milk. These effects are important considerations when feeding premature infants. We hypothesized that total bacterial colony counts (TBCC) and immunoglobulin A (IgA) concentration were not affected by the addition of fortifier even when tested under extreme storage conditions and that osmolality of fortified human milk does not increase with storage. METHODS: Ten frozen and five fresh milk samples from mothers of premature infants were divided into fortified and unfortified milk, and stored for 72 hours at either refrigerator or room temperature. Aliquots were obtained at 0 to 72 hours for TBCC, osmolality, and total IgA, and analyzed by repeated measures analysis of variance (ANOVA). RESULTS: Log10 TBCC in milk stored at refrigerator temperature for 0, 24, 48, and 72 hours were significantly greater in fortified vs unfortified milk; both increased similarly with storage. Osmolality was greater in fortified than unfortified milk; both increased by approximately 4% with storage. IgA concentration was not affected by fortification or storage. To simulate the usual nursery use of fortified human milk, a separate evaluation was performed. Fortified milk was stored at refrigerator temperature for 20 hours, warmed in a 40 degrees C laboratory incubator for 20 minutes, and placed in a 34 degrees C infant incubator for 4 hours. Samples for TBCC were obtained at 0, 20, and 24 hours and analyzed by repeated measures ANOVA. Log10 TBCC in fortified, refrigerated milk did not change over the 20-hour storage but increased during the simulated 4-hour usage. CONCLUSIONS: These findings may warrant consideration when using human milk in the neonatal nursery but support recommendations to use commercially fortified human milk within 24 hours. *********************************************** The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(TM) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html