Usage patterns
幼少期を〈場所〉で過ごすto spend one's early childhood in (a place)
He spent his early childhood in America.
幼少期に〈事〉を経験するto experience (something) during one's early childhood
She experienced a major earthquake during her early childhood.
幼少期から〈動詞〉to have done something since early childhood
He had been learning piano since early childhood.