Could do with some advice please. My DS is 4 weeks old and during the day is a very placid, easy baby, sleeping lots and feeding every 3 hours. (EBF). However, between about 8pm and midnight he is grizzly, cries a lot, seems very hungry and it's always a battle to get him to sleep. I give him a bottle of expressed milk early evening and then after that breast feed him but my boobs are getting sore as he's snacking for hours. Do you think a bottle of formula might help "top him up" and get him to sleep? I don't think he's got colic, he doesn't seem to be in pain, just grumpy. Any advice appreciated!