Other's have suggested that it may just be the heat and or teething and they may be right. But, your description is of many changes,eating habbits, urin load, and sleep patterns. Whenever an infant child has significant pattern changes to the things you listed I would call a doctor. The pattern of change is across the bord, I would let the doctor know how significant and comprehensive these changes are. There are some pretty serrious possibilities that could start with such symptoms, though they are unlikely. The most imeadeate concern is dehydration, and you should definely tell your doctor aboult your child's lack of urine and refusal of fluids. Dehydration can occur in mild illnesses with infants, and is a significant problem.