Can I amend my 2018 return to claim initial Adoption expenses in 2017, long before a child entered the picture?

We began the adoption process in 2017 when we applied for assistance with an agency and paid a lot of money upfront.  It looks like I could have already started taking the adoption credit long before we were ever placed with a child through this agency?  So can I go back and amend my 2018 return to include these 2017 expenses?  Would I just put the child's name as unknown as we would not have known any child at that time?

Thanks.