The vagus nerve and the heart. Fibres of the vagus nerve (right/bottom of image) innervate the sinoatrial node tissue (central and left of. image). H&E stain. Parasympathetic innervation of the heart is mediated by the vagus. nerve. Specifically, the vagus nerve acts to lower the heart rate.
1 An 8-pound newborn drinks about 2 ounces at a time, roughly 10 times a day. 2  A 14-pound 4-month-old drinks 4 to 5 ounces at a time about six to eight times a day.  A 16-pound 6-month-old drinks 5 to 6 ounces at a time, roughly five times a day, in addition to eating some baby food.
At birth your babyâs stomach is size of the cherry, and it can only hold 0.1 to 0.2 ounces (5-7 ml) of milk. This is the reason you must constantly feed your newborn. The stomach grows very quickly each day, and by day 3 the stomach is a size of of a walnut and can hold 0.8 to 1 ounces (22-27 ml) of milk.