It is part of the human condition to want. Babies are born with a reflexive grasp.
Adults often find it a winsome trait when a tiny fist closes around an out-held finger.
This new little creature likes us, we think, or at least is reacting to us personally. As the child develops, the reflex turns into a useful skill. This same grasping infant is uninhibited when vocalizing his needs. When my first child was a newborn, I read a terrifying chapter in Benjamin Spock s Baby and Child Care entitled Unexplained Crying in the First Three Months. She clearly wanted something and wanted it now.