My baby is 8 weeks old and is being bottle fed. He will take 3 ounces then go all rigid and scream like he is in pain and continues this while being winded as well. He looks for more milk but screams when I give him the bottle. I just don't know what to do to help him? He used to take 5ozs every feed but now he will only take 3 each time. This happens with both breastmilk (expressed) and formula ( I am using SMA gold) If anyone has any experience or advice I would be very grateful.