i have a six month old who has decided he doesn't want to drink anymore. he had 14 oz of milk yesterday and won't touch it today. i have tried water in a beaker AND a bottle but he won't have it, tried VERY diluted fresh juice, tried changing the teats on the bottles but he won't have it at all. hes having solids so isn't starving but he isn't drinkig...any clues b4 i ring the useless hv?