LO is 16 wks and EBF; over the last week or so, he's become very fussy while nursing, and won't nurse longer than 5 min. He'll unlatch and grunt/groan/whine, stiffen his legs and bring the up to his chest, and look like he's straining to poop. I'll burp him, and sometimes he'll burp, but then do the same thing when I bring him back to the breast. When he does poop (1-2x per day), it looks normal--runny, yellow/orangey. He's also generally more fussy than normal, which I attributed to being tired, as his naps are crap right now.

Does this sound like it could be constipation even though his poops are normal, and he's going at least once a day? My other thought was that it could be related to teething, as he likes to chew on his hands/other things, and is drooling a ton, and I've heard teething can make nursing painful. But would that cause the groaning while nursing?

Any ideas? We see our pedi in about a week for his 4 month visit, but if this continues over the next few days I'll probably call her...