My baby - almost 11weeks old now - is breast fed but at night has a bottle of expressed milk as his last feed. He gets 150ml - just over 5 ounces - he completely finishes it and does look for more but after a minute or two when he realises there is no more he settles and sleeps. He was sleeping 8 hours but now waking up at about 5am (6 hours) - just wondered if i can increase what I offer him or will it be too much for his stomach and make him reflux/spit up/uncomfortable