Even when they cannot be always available, the parents' fierce, unique love for their child makes them different in the child's heart and mind from all other caregivers. In spite of a long working day, a parent's passion for his or her child retains its many nuances of emotional intensity, ranging from rapture and delight to impatience and even rage, that no other relationship in the child's life can match. Even very young infants are smart enough to recognize this passionate commitment and to reciprocate it in kind.
