My DS is 3 weeks old and is up 3 or 4 times in the night hungry and is taking 90mls.. He drains the bottle and then is up again 1.5-2 hours later wanting more.. He rarely seems satisfied after a feed i give him water between feeds and ive tried giving him more milk each feed but it doesnt seem to make a difference.. contemplating hungry baby milk but I've heard mixed opinions on it.. What do you suggest?