This is the 8469th most frequent Polish word.
pomponikiem
A diminutive form meaning "little pom-pom" or "small decorative ball."
In this sentence, "pomponikiem" is the instrumental singular form of "pomponik," used to describe an object the child interacts with.
Dziecko bawiło się kolorowym pomponikiem.
The child was playing with a colorful pompon.
Here, "pomponikiem" describes the decorative fluffy ball attached to the hat, showcasing its ornamental use.
Jego czapka była ozdobiona białym pomponikiem.
His hat was decorated with a white pompon.
"Pomponikiem" is used to specify the type of ornament detailed at the end of the belt.