What has happened to my contented baby?

The same thing happened my now 8 week old. It seems to have peaked at 6 weeks - crying, grunting, general fussiness and is lessening slightly each week. Their little tummys are immature and find it hard to digest the food so the only way they can react is by crying / grunting. I find when my son does this the only thing that helps is rubbing his tummy in a clockwise motion 5 times then bringing his legs up to his chest and this sometimes releases the trapped wind. Just make sure you wind her 2 - 3 time throughout the feed and give her a good winding afterwards. I find gripe water also alleviates his pain.If nothing seems to alleviate her discomfort just give her lots of cuddles and know that as the weeks go by her digestive system will be gradually maturing and you should see less of this behaviour . Lots of luck with your little one.