The word "育婴" is formed by combining the character "育", meaning to nurture or raise, which is historically composed of elements suggesting rearing or growth, with the character "婴", meaning infant, which is constructed from the radical "女" (woman) and the component "贝" (treasure) to denote a precious child. Together, these characters create a compound where "育" specifies the action and "婴" specifies the object, directly conveying the concept of caring for infants.