"The hands that rocks the cradle rocks the world". This refers to our parents who is the one who sustained our needs from the very beginning. The relation to an infant and the development of the toddlers is that parents, are the one who help their child develop from the very beginning. They spent sleepless nights just to answer their child's needs and wants. This relates to the stages of an infant or a toddler growing and continuously developing for the brighter future ahead.
note: own opinion