Sometimes when a parent has been changeable and inconsistent, a child can seem clingy and grasping when attention/supplies/input are available, thinking the famine will return at any moment.
Thinking of attachment parenting, infants and toddlers, a baby needs as much milk as he needs, and when he's done he'll turn away. A toddler needs as much holding and carrying as he needs, and when he's done, he will wiggle down and take off.
photo by Sandra Dodd
(original writing)