CAT and fetal growth restriction: Compared to IUGR, IUGR + DMG-Na group had highly significant increased final body weight and significant increased ADG (<i>p</i> < 0.01); it enhanced intestinal morphology, notably increasing villus height and villus height-to-crypt depth ratio in the duodenum and jejunum (<i>p</i> < 0.01); immune markers improved, with elevated jejunal sIgA (<i>p</i> < 0.05); and antioxidant status was restored, demonstrated by increased jejunal GSH and CAT activities (<i>p</i> < 0.05) and decreased jejunal MDA content (<i>p</i> < 0.01).