Normal children of both sexes and all cultures will follow a more or less standard and universal developmental pattern and timetable, and reach approximately the same level of development at maturity. While a particular culture's need and expectations and teaching will shape the course of development and affect adult capabilities to some degree, normal individuals, whatever their native culture, if transplanted and taught, could learn to meet the normal demands of their adapted cultures.
Stella Chess, Jane Whitbread (1978). “Daughters: from infancy to independence”