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.
How Much Is Enough? Newborns start out with a stomach that can hold only a small amount at first. One to 2 ounces per feeding is usually enough early on, but by the time your baby is 2 months old, for example, she'll need 24 to 32 ounces a day and about six to seven feedings in a 24-hour period. Here's a rough idea of how much formula your baby needs, and how often she needs to be fed: Age. Amount per feeding.