Hi,
My son liked his pacifer at nap time as well. Then when he was off the bottle at 16 months, he LOVED his baba, all the time.
People made comments to me all time, I assured them he'd be off it before he started school, so they need not worry so much.
At 25 months I needed to buy new ones for him. I bought 2 packs, of the large ones. (I didn't realize they got bigger with the kids age.)
He popped the new, big ones im his mouth and started to laugh. He pulled it out, looked at and laughed again. He thought it was a bit weird I guess. He would put it in for shorter times each time for the next few days. Then day 3 he asked for it and I said "no". "Ba ba for night night time." He fussed a bit, I changed the subject. As promised I gave it to him at nap time. Few days later he didn't ask and I didn't offer.
They will get rid of it on their time. Don't rush them because of other people. And it gives your little one comfort. It's a big, sometime scary place for them. Sometimes I want a baba and a warm blanky. ;-)
Good luck