this as a sign when babies start grabbing the food that you are eating. this again is a vague signal because usually babies at around four to six months get attracted towards different objects and tend to put it in their mouth.
frequent waking up during the middle of the sleep can be a sign that your baby is still hungry. but you got to make sure that your baby is only getting up for food and not due to any other reason such as illness, teething problem or growth spurt. 