Helppp

Yackelin

Can someone tell me why my 3 month old been crying really bad for about 3 days yesterday we were at the store and she started screaming really bad crying couldnt make her stop at alll until she fonally fell asleep and today she was asleep and woke up screaming again crying and cannot make her stop should i be concern take her to the er ? I been taking her temperture and she doesnt have a fever also her head is always really hot idk if thats normal???