When can a baby put her own pacifier back in?

I am just wondering as I wont be able to move her from the binet to crib until she can, as she cries during the night because it falls out of her mouth. It is easier when she is in my room to put it back in during the night. She is 25 days old and can already hold the dummy when it is in her mouth. I do not want to transfer her to her crib for quite a while, as her room is not that close to mine, but just wondering how old she will be when I will be able to. Thanks!!