my 7 month old son has very bad constipation. ive given him 2oz of water daily.... he also gets prunes daily and i give him prune juice mixed with water his poop is still very hard and he cries. he only gets 2 breastmilk bottles a day and the rest are formula (which is powdered) do to my lack of supply. he also eats stage 2 baby foods. what else can i do to stop the constipation and to prevent it?