Hi, I'm new here and have come for advice. I have a pet name for my daughter that is very unique and I came up with it when she was around 2 weeks old, she is now 17 months old.

Problem is I have a gorgeous niece who is 5 months younger, and her mum (my sil) is now calling her daughter the same pet name. I feel a bit weird about it and I'm not sure how to approach the topic. I don't know if I'm overreacting or am valid to think the name is so unique and she called her baby something different and then all of a sudden the past couple of months I have noticed she uses my pet name. What would you do? ???? TIA