I'm so sorry for your loss. You're right.....a mother should never have to bury her child.
My DH planted Stargazer Lilies before he passed. They bloomed every July....about the date of his passing. I loved those beautiful flowers and they were like a reminder from him that life goes on and I was supposed to make the most of it....the best I could.....without him beside me.
I know how difficult anniversaries can be. Just treat yourself kindly and know that your baby is watching over you.