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To explore and compare fetal cortical brain development and infant neurobehaviour in spontaneously conceived (SC) and assisted reproductive technologies (ART) offspring. A prospective cohort study of 210 singleton pregnancies including 70 SC pregnancies, 70 conceived by in vitro fertilization (IVF) following frozen embryo transfer (ET), and 70 IVF after fresh ET. The ART infants showed lower ASQ scores, especially in the fresh ET group (global ASQ z‐scores: fresh ET mean[SD] ‐0.3[0.4] vs. frozen ET ‐0.2[0.4] vs. SC 0[0.4], p<0.001). Fetuses conceived by ART show a distinctive pattern of cortical development and suboptimal infant neurodevelopment, with more pronounced changes in fresh ET. These findings support the existence of in utero brain reorganization associated to ART and warrant follow‐up studies to assess their long‐term persistence.
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