Just to throw more compilations in, I thought Disney (not DVC) will only allow occupancy of 4+1 infant in the DVC 1 bedrooms that don't have the sleeper chair. It's only on a DVC points reservation that they will allow members to have 5 in the other 1 BRs. And we have to bring our own bedding for that person. That has been the rule in the past when booking with Disney.
But cheese mouse said "max" of 5, so maybe that's what was meant.