How do I stop swaddling my 6 month old?

My son is 6 months, and I feel like he is getting too big to swaddle. Also, it is getting hot and I'm worried he will be too hot this summer when sleeping. How do I get him used to not being swaddled though? He either can't fall asleep or wakes after only one sleep cycle (45 mins) if not swaddled!
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