Does nec in newborn cause gastrointestinal perforation?

Maybe. Nec is short for necrotizing enterocolitis. Nec is an inflammation of the intestines, typically in premature infants, and can lead to perforation of the gut, but not always. This can be a very dangerous condition, but most babies survive and even fully recover. Talk with your nicu team to learn more about what is going on with your baby so you can understand why they are doing what they are doing.
Necrotizing enteroco. Yes it can. The severity of nec is highly variable but in some cases the inflammation and compromise to the vasculature of the GI tract is so severe as to cause perforation of the intestine and secondary peritonitis which can be very seroius; even fatal.