Hello . My baby is 4 months old . I feed him breast milk completely. From Last 2 days , he is taking feed properly from my right breast but as I change his direction to left breast he gets cranky and does not take feed . Then I roam around and try to latch him vertically . After that he tires to hold the nipple and then takes the feed . However when he is sleepy then he takes feed from both the breasts properly . Please let me know is this of concern and what should I do about it