Is this just a phase?

Brea

My 15 month old has a favorite stuffed animal. All of a sudden she humps it a lot now. Also as self soothing method before sleeping. Has anyone else experienced this? Im kind of embarrassed about it even though i know i shouldnt be. Will.she eventually stop? I cant seem to get her to find another way to self soothe unless i took her favorite toy away. Is this common with a lot children?