Hello I just changed my 2 month daughters formula from gerber soothe to similac total comfort. She was doing good on the soothe but wic wanted me to try the similac first. She has been on the new one for 2 days now and is constantly unsettled and cries when I lay her on her back. She has had 2 bowel movements today and they were dark grey and liquidy. Is that normal. I am switching back to the soothe.