My baby is 5.5 weeks old and has had a change in the past 3 days. She is very sleep in the mornings and early afternoons but when she wakes up she cries terribly and arches her back like she s in pain. Then in the late afternoon, evening she is crying a lot. Squirming like crazy (arms and legs flailing) and arching her back and turning red. Her eating patterns are changing as well. Yesterday she ate at 2.5 hr intervals a couple of times and seemed like she couldn t get enough food even though she was eating her usual 4-4.5 ounces. Last night she only ate 2.5 ounces at her feedings. This morning she ate 5 ounces and then 2.5 ounces at lunch time. She sounds a little congested but does not have a fever.