PPARA and retinopathy of prematurity: In this study, fecal samples at T2 were also employed for metabolomic analysis, and 119 increased DAMs (nervonic acid, linoleic acid, N-methyl-2-oxoglutaramate, N1-acetylspermine, and fructosyllysine) and 263 decreased DAMs (prostaglandin F3a, iodiconazole, N-acetylhistamine, 1-phenyl-1-propanol, and 3-hydroxy-5,8-tetradecadienoylcarnitine) in ROP were significantly enriched in a number of pathways, such as the PPAR signaling pathway, linoleic acid metabolism.