This is my 2nd child but she's completely different to my first. She is currently 5 weeks old and for the past 3 days has only taken 1-2oz (30-60ml) per feed and that's been hard to do. He doesnt feed happily and fussed the whole time. Im us using infacol currently to help with my colic. She only wakes up via crying and when awake isn't content for any more than 5mins before she starts grunting and crying. Meaning she is sleeping most of the time as she is so happy when awake. Should I be worried and has anyone else experienced this that can offer some advice?