Nicole Dodds first noticed her son, Rowan, was having trouble using the right side of his body when he was about 6 months old. Babies typically use both hands to pick up toys and lift their chest off the floor at that age, but Rowan was mostly using his left arm and hand, keeping his right hand balled in a fist.
That started a string of doctor visits. Around Rowan’s first birthday, doctors did an MRI and diagnosed his one-sided weakness as hemiplegia, probably caused by a stroke he sustained in utero. This surprised Dodds, since as far as she knew she’d had a totally normal pregnancy and birth
Perinatal stroke — when an infant loses blood supply to the brain in late pregnancy, during birth or in the first month of life — is one of the most common causes of hemiplegia in infants, affecting anywhere from 1 in 2,500 to 1 in 4,000 live births in the United States every year.
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https://www.washingtonpost.com/health/some-infant-experience-strokes-in-utero-causing-physical-and-cognitive-problems-new-therapies-may-help/