The short answer is no, but all parents need to give swaddling a try.
If parents do not swaddle, they will be covering their newborn in a blanket to help keep them warm.
A blanket will work to keep them warm, but the possibility of a loose blanket blocking the newborn’s passage ways is a risk. In the case of swaddle blankets, they are tightly wrapped around the body and will not be loosen easily. Thus, the warmth will be maintain without any safety risk.