Planting for babies

Alison, 🌈 👶🏻 born 7/26/19

I don’t know much about planting or gardening since this is the first home I’ve ever owned but I had two miscarriages all within the last four months and want to either plant a tree or garden for my babies. Can anyone who’s done this share some ideas and maybe share some photos? Not sure if I want to do a tree or flowers yet. I just want them to last. Felt this would help me with the grieving process to have something to remember them by. My first baby was due in July and this last one I lost was due in November 2018.