When should you stop swaddling your baby? Do you wean off slowly or is there a time you just suddenly stop swaddling?

I think there is no hard and fast rule on when to stop, some of my friends just let their babies take the lead. A few stopped when their babies are around 3-4 months. One of my friends was saying her daughter waves and kicks around in her sleep and so she gave up swaddling her at 3 weeks old.