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.
Your newborn will nurse about 8 to 12 times per day during the first weeks of life. In the beginning, mothers may want to try nursing 10-15 minutes on each breast, then adjust the time as necessary. Breastfeeding should be on demand (when your baby is hungry), which is generally every 1-3 hours. As newborns get older, they'll nurse less often and have longer stretches between feedings. Newborn babies who are getting formula will likely take about 2-3 ounces every 2-4 hours.