A.O.
I wouldn't force it yet. If he is only using it for naps and bedtime you have already won the hardest battle. But for sleeping he is using for comfort to go sleep. Trust me a good thing. I would wait till at least a year. My daughter just lost hers in the house. As we started losing the multitude of pacifiers she quit noticing she wanted them. When she found them later she gave it a final suck then threw it in the trash herself. She knew she didn't need it and it was her decision to toss it. Again this was between 18-24 months.