My LO is 6 months old. The last three nights she has been sleeping horribly. Up on and off all night. Then yesterday and today her appetite is almost non existent. She hasn't done a full feed in about 12 hours. She will nurse for a couple minutes at a time every few hours, but not a full feed. Could this be from teething? She has no teeth yet. Or maybe just a normal thing that happens around the 6 month mark?