Three-month-old baby love to eat hands is very normal, three-month-old baby eating hands is to use the mouth to perceive the world, eating hands itself is the baby hand, eye, mouth coordinated action, is a normal cognitive process, is to monitor the baby’s normal development level of the indicators. The baby’s tactile development is also very good, can promote the brain, hand, eye coordination ability, the baby’s intelligence is also beneficial, mother do not worry, as long as the baby to wash their hands diligently, cut the baby’s nails short, keep hygiene can be. Baby eating hands when the mother should not be too much emphasis, forced intervention, when the baby grows up, add complementary foods, milk teeth eruption, cognition continues to increase after the hands will not eat, if the mother interferes too much, only with a simple and rough way to stop, the baby’s sucking requirements are not met, will affect the baby’s physical and mental development, will lead to the oral period after the still eat hands.