My DS is 6 weeks old. Breastfeeding has had its ups and downs but we are finally starting to get the hang of it on a regular basis. But the last couple days whenever he latches onto my right boob he cries. When he latches to the left side everything seems to be fine. I don't know what the problem is, he continues to eat but he cries. Anyone have any idea what this might be and some advice for what I could do?