My midwife said she doesn’t recommend swaddling as babies need to move to regulate their temperature. However, the lullaby trust recommend using thin materials such as muslin cloths or a thin cot sheet if you’re still wanting to swaddle xx
I bought some mama cheetah swaddle bags on vinted. Its a light cotton material so she doesn't get warm but she feels secure
I think you can get those swaddle up bags for hot weather