Re: How can I make my baby's mouth open WIDER
My son used to have the upper lip tucked in too. I'd just kind of brush it with my finger to get it out. I never noticed a difference in his latch, but it seemed like his lip should be out so I always did it.
Another thing you could try is 'scissoring' your breast between your first 2 fingers as you put it in his mouth. Put your fingers right on the outside edge of the areola and squash it a bit flatter, then when you put it in his mouth you can let go and it will sort of push his mouth open wider.
You could also try showing him by opening your mouth really wide. He might mimic you and open his mouth.
Here's an article about getting baby back to the breast. Not everything will apply to your situation, but there might be some other tips in there that would be useful for you.
With both my kids there was a little pain in the beginning, just mild soreness, as they were learning how to latch. I wouldn't be too concerned about it unless it is really bothering you or if you see damage to your nipples.
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