There is NO PLACE for ANY formula feeding except for maybe in dire emergencies. In virtually all cases of need the milk from another mother should be given.
I have seen one child’s life being saved some 30 years ago from necrotizing enterocolitis (NEC) by insisting to the surgical department that the baby should have straight away breast milk. The department thanked me for that, it was not known to them at that time, and I was thankful to Bore Olam that because of my work in the tropics [Suriname] I knew about this.
and see many more articles about: Human Milk Oligosaccharides to Prevent Gut Dysfunction and Necrotizing Enterocolitis in Preterm Neonates