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.
Newborn babies need quite small amounts of formula to start with. By the end of their first week, most will need around 150 to 200ml per kilo of their weight per day until they are six months old. This amount will vary from baby to baby. Although most babies settle into a feeding pattern eventually, they vary in how often they want to feed and how much they want to drink.