Check the house rules beforehand. Sometimes there are really nasty traps (unintentionally included). For example, according to the wording, we are not allowed to open the windows at night and also not to place anything, really nothing, on the balconies. I have been trying to change this since the first WEG meeting, but there were always more important topics... It might still be possible beforehand, but I would not formulate it as a condition for signing, rather as a constructive suggestion in the interest of the future WEG.
At the first meeting, suggest a joint garden party to get to know each other better and socialize.
Regarding prams: They are regularly not allowed in hallways. Not because of any sensitivities, but simply for fire safety reasons. Prams represent a fire load in traffic routes and therefore may not be left in the hallway for an extended period. This would require a separate room with a fire protection door. The often-cited case law mostly deals with short-term parking until the child is parked. Then you are supposed to either take the pram into the apartment or put it in the basement or storage room. This is actually a contentious issue that repeatedly flares up between parents and alleged or at least by the parents assumed child-haters. It has nothing to do with the children themselves. Even storing doormats and shoes in the hallway (there are even stories of whole shoe racks in other buildings) is not allowed for fire safety reasons and is also quite questionable. I will leave it open whether one doormat per apartment really determines whether a house fire develops properly or not, but what some people store in front of their apartment door is not only a fire load but also an obstacle in the escape route.