relatively strong
As Rousseau points out at the beginning of Book II and in para551 below, strength is always relative to needs. (See para217_note1 and para223_note1 above.) In this pre-adolescent stage of growth, the child's physical powers are more than sufficient to satisfy his basic needs, especially since his need for sex has not yet been aroused. Unlike Freud, Rousseau believed that sexuality developed only with adolescence; up until then the dominant instinct is amour de soi, a purely "innocent" form of self love. See para12_note1 above.