It's hard to say. Relatively speaking, nappies themselves haven't existed for all that long and whether there were swaddling clothes lovers in the past might be an interesting thing to ponder.
The biggest problem is communication and record - an AB/DL a century ago would be far less likely than we to ever encounter anyone else with similar predilections so the chances of finding literature, organisation or community relating to this stuff would be low. I'm sure a love of the childish and infantile has existed in people for as long as civilisation has but the actual identity, definition or subculture as we know it is probably relativity new on any meaningful scale.
All in all, I would guess that the human psychology and environment hasn't changed all that much to make this completely new but there is less repression and more communication these days while evidence of activity in times past would be hard to come by.
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