My 5 week old went from happily eating 4oz or a little more every feeding and sleeping in blocks of 2-4hrs to the last few days eating 1-4oz (4 if I'm lucky it's usually 2oz max) and sleeping 20min-3hrs (again 3 hrs if I'm lucky) and the food is only eaten in small struggles with him sobbing the entire time and begging for the food but not wanting it once presented and his naps are only had in my arms or not at all now. Has anyone else had this problem with their newborn lately?