Density (number per unit area) of glial fibrillary acidic protein (GFAP)‐positive astrocytes (A,B), size (in μm2) of GFAP‐positive cell bodies (C,D), density (number per unit area) of ionized calcium‐binding adapter molecule 1 (Iba1)‐positive microglia/macrophages (E,F) and Olig2‐positive pre‐oligodendrocytes (G,H) in the superficial white matter (WM), the deep subplate (dSP), the superficial subplate (sSP) and the cortical plate (CP) in non‐cystic periventricular white matter injury (PWMI) in very preterm and preterm cases, compared with control cases. **P < 0.01, ***P < 0.001.