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.
1 Start newborns with 2 to 3 ounces of formula per feeding (for a total of 16 to 24 ounces per day).  As with breastfeeding, the number of feedings will decrease as the baby gets older, but the amount of formula will increase to approximately 6 to 8 ounces per feeding.