We kept super tiny things up high where it was a "special" place for DD but to be honest we realised that we didn't really do much for DS and how much we stressed with DD. He got into a few things and chewed on stuff like trains and cars that we would have had a conniption over with DD but he survived. I think put anything that is a clear choking hazard away, like Lego etc. (obviously) then anything else that is just special and maybe keep them in your son's room.