In a neonatal mouse, NEC model was induced by high‐osmolarity formula and hypoxia‐cold stress, and ALAS2 expression was significantly downregulated in ileal tissues (p  < 0.01), coinciding with elevated oxidative stress (increased Fe2+/malondialdehyde [MDA] and decreased superoxide dismutase [SOD]), inflammation (increased TNF‐α/interferon‐gamma [IFN‐γ]), and ferroptosis activation (increased acyl‐CoA synthetase long‐chain family member 4 [ACSL4] and decreased ferritin heavy chain 1 [FTH1] with mitochondrial shrinkage). This evidence concerns the gene TNF and necrotizing enterocolitis.