last week my then 7 week old slept for longer stretches at night for the first time (from 7:30/8 to 12/1am, then 3ish and 6/7ish). He was settling quickly after night feeds and going back in his basket. This was while we were away at my parents. Back yesterday and last night it took two hours to settle him at bedtime, dummy ineffective (had started using a dummy at my parents for first time to settle at bedtime), he then slept for 3.5hrs before waking to be fed, then awoke a couple times before feed at 3:30. He didn't really settle after this at all and hasn't slept for any time really since then. He will fall asleep on me but wake as soon as he is put down and really scream. Not sure what is going on or what I have done wrong. He seems exhausted but I can't have him on me all the time (moving house so need to pack). I assume he is too young to be left to cry for any length of time?? It is so odd how sudden this is.