My Jaylex was born preterm (35.6 weeks). he is now 3 weeks today.I pump then put milk in bottle for baby. i pump every 4 hours till both beast are drained..after feedings he still seems hungry and he waking every 2 hours for more milk... and drinking 2 to 4oz each time.he is now fussy, has gas, stools are watery and dark yellow(mustard color). I dont know why he is going the this. I think maybe its because he is not getting enough hindmilk. because the milk is water and white..not to creamy.i give him little tummy's gripe water. with every feeding it doesn't seem to be helping. So should a mix formula with my beastmilk to add some fat?? or should i just add a little cereal to the beastmilk to add fat?? to make him feel full.. please help.. new mother.