My 3 week old has been doing well with breastfeeding, but with the last few days he's started to favor my left breast over my right.. my left breast is bigger and always feels more full. I can get him to latch on the right and he will pull away with milk on his face, so I know its producing. But he'll only latch for a few minutes. My right breast is softer. Does the difference in breast fullness make it better/ easier for him? Any tips would be great.