Does anyone else have any ideas on how to get a 6 week old to sleep well through the night ? She is…

Does anyone else have any ideas on how to get a 6 week old to sleep well through the night ? She is formula fed I have tried everything swaddling a swing a rocker etc she just wants to be held? Which is ok but I have had a c section and after an hour of holding my wound hurts ? Any suggestions much appreciated she also has colic through the night and not day? Which seems odd?