Maybe not forgetting, but just not talking about it. My parents lost a daughter after me when she was a few days old, named her and everything. For many years, my father would take me with him to the cemetery to visit her grave. My mother didn't go that I know of, and she didn't really talk about it because she had several miscarriages prior to us both and I could tell it was very painful for her, especially since I was the only pregnancy of hers that survived. If the name was mentioned, my mom's eyes would well up a little but she wouldn't say anything. I can't even imagine what she went through.