I Can't Believe I Forgot 😔

So yesterday I realized that I missed the 2nd year anniversary of my 8mth old so passing away. January 26th made the 2nd year, and I completely forgot. I feel like the worst parent ever, because I wasn't suppose to forget about him. And the saddest part is, that my 6yr old niece brought it up, and asked about him yesterday, and that's how I remembered. I went through the worst depression of my life when he passed, and I didn't smile for a long time, and I feel so bad that I forgot... Sorry for the post, I don't have many people to talk to, and I just felt so bad about it.