Why My 11 months baby always want her Mumy’s towel for fall sleep ?

I have 11 months twins baby one is boy and another is girl, my girl is fully bottle feeding baby she is doing everything fine, she is active enough but when she need to fall sleep she always cried if she didn’t get her Mumy towel to put on her mouth. She started to do this without notice, I’m totally surprised that she was looking for her Mumy towel to put on her month before she fall sleep even she fall sleep on my lap she want want it upon put her on the bed. Doesn’t it disturb on her development..? Is this bad sign ..? Anyone pls help me to answer ..? I didn’t even gave her pacifier. Suddenly she started to up the towel on her mouth while sleeping. #AskingAsAMom #OAPS #respect_post #everyone