At 14 weeks DS goes to bed exhauseted at 7ish and (usually) sleeps ok for the next few hours. Then everything goes wrong: from 10ish he wakes and feeds every one and a half hours until about 4am when he wakes howling and writhing as if in real discomfort/distress and can't be pacified (by feeding/distraction/cuddling/etc) for more than a few minutes at a time for the next few hours until we get up for good in the morning. He appears to be straining to fart/poo although he doesn't get this distressed at all during the day.
His daytime naps are very short as he is an incredibly light sleeper (and has a noisy 2 yr old sis) and won't stay asleep if i lay him down. I'm worried that he must be as exhausted as i am.
Can anyone help?