Has anyone experienced anything similar? Baby is in good health. Went to pediatrician on Friday to get her checked out for something totally unrelated.. But for the last week she was very fussy and did not want to be put down. also did not sleep much. We changed her formula to see if it would make a difference. Well Saturday the fussiness stopped and she was very tired. She only had 19 oz that day when she usually has about 30! Could it be she just wore herself out? This morning she is her happy usual self but still eating less.