I believe the advice is to wean the swaddle when your LO starts rolling as it's not safe after that. I think I started weaning it at around 4-5 months though, (just one arm out first, then the other), cos if I remember correctly he was starting to outgrow it and I didn't want to buy more, already having a load of sleeping bags from my daughter. Otherwise I think you can carry on really until your LO is starting to roll.