I’m due with my 1st baby in 3 weeks and a friend loaned us her arms Reach Co-sleeper that she used for her 2 kids and was also used by at least one other person. My guess is it’s like 5 years old. It was in her garage for a few months and then she gave it to me. We washed the fabric liner and sheets but I’m feeling weird about it now. The mattress seems lumpy and I feel like I’m going to be nervous using it. So my questions, I guess, are:

-Would you use a used bassinet?
-Do you know how the mattress is supposed to sit in the Arms Reach, specifically? It feels like it has a bump/air bubble in the middle, maybe from the folds?

Thank you!!!!