About the unicorn mobile, either Emma using it for her own future child or her giving it as a gift to her brother are both 10000000% acceptable to me.
About the dreamcatchers, there was also some discussion a while back about a trinket that was hanging inside the edge of her crib and whether it was a tiny dreamcatcher or just a teething ring or something. I still maintain that whatever it was, it looked dreamcatchery.