DS is 13 weeks old and exclusively breastfed - tried him with a bottle a day or two ago and he didn't remember what to do with it. In the last couple of weeks I have been struggling to get him latched on during the day - he arches his back, cries, squirms and generally gets quite upset. Sometimes I just put him down again, thinking I must have misread a cue and he's not hungry; sometimes he will latch on if I screen the outside world with a muslin over his head. If I do get him to latch on he will generally only have a quick feed, so isn't getting a full belly.
As a consequence he is now waking every couple of hours in the night for a feed - and he's properly hungry and takes a decent amount each time. He used to only wake once or twice in the night, so I'm getting very tired...
What's causing this? He's showing signs of teething starting (dribbling, everything going into mouth and grislyness) but is generally happy enough... until I start to feed him! What can I do???