I think it was around their first birthday, not sure when exactly, but it was pretty painless. I would literally turn my back and tell them quietly "its not time yet, go back to sleep" and after a few nights they stopped waking up. My son was done in around 2 weeks and my daughter about the same. I knew they didn't need to nurse, they just wanted to nurse, so if it was available great, if not they didn't sweat it.