I am a single mother by choice. My baby, now 10 months old, was conceived using an “open ID” donor from a sperm bank, which means that when my daughter turns 18, she can contact the donor via the sperm bank.

Right now, however, we can be in touch with other families who conceived using the same donor, through the sperm bank’s private online-connection platform, other donor sibling registries or both. I am questioning whether it’s fair to my child to introduce her there. I do not post about her on social media and believe in protecting her privacy. But I believe strongly that she needs to know her origin story and understand, from an early age, that she has some 15 to 20 donor half siblings. Still, part of me feels that she — not I — should decide what interaction she should have with her donor half siblings and their families.