my DD2 wanted to be wrapped untill she was around 5 months old, in the end I just began wrapping her a little looser each time and eventually she got use to not having it, I am thinking your DS probably wants to start sleeping without being wrapped but he may not like it straight off as he is not use to it, maybe give it a go next sleep time and see how he goes, otherwise if he doesnt like it start doing it gradually and he will get use to it.

good luck with it all, he is such a cutie