hun some babies just dont like being in slings. maybe he finds you too hot. i dont like cuddling DH when it is hot because I overheat easily. DD1 hated the sling too

do you have a bassinet for your pram? can he try to sleep in the pram? our bassinet looks similar to our bassinette from inside so DD2 had no issues with it. maybe there is something that you do or he does everytime he goes to sleep in his bassinette that he associates with sleep and needs as a comforter? Dont worry hun, you are doing a great job. try asking your MCHN about sleep issues and they might send you to sleep school. also sometimes when babies cry before going to sleep it is them settling. if he is clean and fed and you have done everything he might need then there is not a lot you can do and he may just need to cry. it is his way of protesting and the only language he knows.