P.M.
When my daughter was born, people still lived in caves and pediatricians advised getting all babies on a 4-hour feeding schedule. My daughter needed to eat every 2.5 hours, and I got scolded for that. So for awhile I tried coaxing her to nurse longer at a feeding. She always spit up the last ounce or two – she just couldn't hold that much food at once. So I fed her what she actually asked for, and every 2.5 hours, and it worked so much better for both of us.
I doubt that you will risk losing your supply – your body is cleverly designed to produce the amount of milk the baby actually consumes. I'd ask a lactation consultant, but I've known a couple of moms with very fast let-down who pumped for a couple of minutes before nursing so the baby wouldn't be overwhelmed by the supply.
