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Aim: To determine whether isolated low-grade germinal matrix-intraventricular haemorrhages (LG-GMH-IVH) and low-grade punctate cerebellar haemorrhages (LG-CBH) contribute to the neurodevelopment of infants born preterm with very low birthweight (VLBW)., Method: A prospective observational cohort study was conducted on infants born with VLBW hospitalized from January 2012 to July 2017 who had undergone serial cranial ultrasounds since birth and magnetic resonance susceptibility-weighted imaging of the brain at term-corrected age. Only those with VLBW carrying isolated LG-GMH-IVH (grades 1 or 2) or isolated LG-CBH (punctate cerebellar haemorrhages ≤4 mm in diameter) or absence of lesions (no-lesion) were enrolled and followed up to 3 years. The Griffiths Mental Development Scales, Extended and Revised version (GMDS-ER), were used to assess neurodevelopment, considering unsatisfactory scores less than 85. Behaviour, according to the criteria of the International Classification of Diseases, 10th Revision, and rehabilitation data were noted., Results: Two-hundred and forty infants with VLBW were enrolled: 34 with LG-GMH-IVH, 17 with LG-CBH, and 189 as no-lesion. The LG-GMH-IVH and LG-CBH groups scored worse than the no-lesion group on all GMDS-ER scores for 1 year, 2 years, and 3 years. The LG-CBH group scored lower than the LG-GMH-IVH group for total GMDS-ER scores at 1 year and 2 years but not at 3 years. At 3 years, compared with the LG-CBH group, those with LG-GMH-IVH received less and later physical therapy, with more frequent attention problems. The odds ratio for unsatisfactory GMDS-ER scores corrected for gestational age was 5.75 for LG-CBH (95% confidence interval 1.92-17.25; p = 0.002) and 2.67 for LG-GMH-IVH (95% confidence interval 1.16-6.13; p = 0.02)., Interpretation: Low-grade haemorrhages affect the neurodevelopment of very-low-birthweight infants. Early rehabilitation might have contributed to their development., (© 2023 The Authors. Developmental Medicine & Child Neurology published by John Wiley & Sons Ltd on behalf of Mac Keith Press.)