Three-month-old babies like to eat hands may be in the period of oral sex, hunger, etc.. 1. Micturition period: three-month-old babies like to eat their hands, may be in the micturition period, eating hands is the baby’s performance of exploring the external environment. Because the baby is full of curiosity about the external environment, the hand is treated as an external thing that has nothing to do with the body. At this time the baby will be through the lips and tongue to perceive the shape and size of the hand, this is normal, with the increase in age, the symptoms will slowly reduce. 2. Hunger: some babies may be due to not eat enough, always in a hungry state, so there will be the phenomenon of eating hands, to increase the amount of feeding. Three months baby like to eat hands, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.