My 18 week DD is formula fed and has been showing signs of teething for a few weeks but seems especially bad today, with red hot cheeks, very dribbly and biting on her hand. She generally drinks 6-7oz 5 times a day but today and yesterday is only really managing 3-4oz per bottle, but she did get up for an extra feed in the night. Do you think this is anything to be concerned about? I don't want her getting dehydrated or anything and it's a real struggle every time I feed her with her just wanting to chew on the teat 