This super simple activity succesfully made my baby occupied for a while as I was still cooking in the kitchen. Well, of course since my 14 m.o baby still mouths almost everything so I let her play in the kitchen so I could still watch her not to eat the eggshell pieces.
Super simple activity for her fine motor skill exercise.
PS. The shattered pieces of eggshells can be reused to fertilize the plants by scattering them to the ground. So lately I never put the eggshells into the garbage can anymore.