I kept the first beanie, first outfit, hospital tags, wires/tubes etc from NICU, DS2 had a belly button clip, DS1 didn't (he had wires and tubes into his) I kept the blood pressure band, the billibands (baby googles for when they are under lights) umm, pretty everything from their NICU/SCN journey. I got dolls made up to their weight/length/HC too. I also kept a stamp and a newspaper clipping. I can't think of anything else.