The phrase "baby nursing" refers to the act of a baby receiving care and nourishment from its mother's breast by feeding on breast milk. Full definition
A significant number of moms, especially the first timers experience mild to mid-range back pain during the pregnancy as well as baby nursing. (welcomeparenthood.com)
But other babies nurse for hours on end because they're not getting milk very well, and their weight gain shows it. (normalfed.com)
Reverse cycling is when baby nurses more at night than during the day. (motherandchildhealth.com)