Crying every time he's done
it could be ear infection - if so try to nruse him more upwards and see if it helps, also
make some breaks in nursing
it could be acid reflux - again try to nurse as upward as possible to see if it hels
it could be need to eliminate and struggle
it could be that you ate something that causes gass and he is bloated - do you eat any green veggies or drink cows milk sour croute cabbage.. if so try avoid for couple days and see.. those things usually linger in milk long after you ate them anyways
do you put him down after nursing or do yo hold him upwards. do hold him upwards after nursing
do you burp him? I know some parents do however nurslings do not need to be burped but still
some burping migt do the opposite to good.
check his tummy after you nurse is it hard and bloated like a baloon or is it soft when you gently push on it, check his tummy very carefully when you are not nursing him and he is fine and
see if it is soft and fine and then remember it, then compare his tummy right after you nurse
and get back to us :).. maybe we all figure out something
of course the ear infection is still a valid option and for this really try to solve it. We here only did a warm cloth compress warmed up in microwave and other then that upward nursing was way to go.