Nasojejunal feeding has been used frequently in my neonatal unit, even with CGA is as premature as 28 week. My concerns were many , but what I would like to highlight: Fat digestion in those babies was compromised and they had very high triglyceride : Preduodenal lipase is inactive beyond the Pylorus. ( Manson WG and Weaver LT : fat digestion in the neonate, Archives Disease of Childhood, Foetal & neonatal ed. 1997; 76: F206-211) Also lack of fortification of EBM , resulted in poor weight gain and MBD
I see it frequently in otherwise healthy babies..the reassuring sign: the postductal saturation is 95-100% in those babies with very well felt femorals. It happened that most of those babies where somehow polycythaemic ( Hb around 200mg%) Also if you do echo..likely the duct will be still open ( transitional). If you check the Saturations pre and post few times a day (baby is healthy and feeding) you will see the difference decrease and likely to normalize around day3. I still have no physiological explanation.