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.
While some infants may be eating just 24 ounces a day, others may need 32 ounces or more. Rules of Formula Feeding A good rule of thumb is that the average baby at this age is likely to drink about 5 to 6 ounces of formula every 3 to 5 hours. The American Academy of Pediatrics, in the book Your Baby's First Year, also provides a nice guideline and suggests that 'on average, your baby should take in about 2 1/2 ounces of formula a day for every pound of body weight.'