Any ideas why this could be? We regularly give him infacol before feeds. He feeds well at 7pm and then wakes for feed at 10.30pm. At 1am he wants a feed and then 2 hourly after this. The problem is that he on;ly feeds for a few minutes at each of these mini-feedings and I am wondering if this is the cause of the grunting/straining etc - ie he isn't sufficiently fed? If he was awake more at these feedings he would probably get more milk and be more happier - but I am struggling to keep him awake long enough. He also passes a lot of wind between these times. thanks in advance!