I didn't expect the household items section to get so much use, but my 4 month old stares at the little spoon card for ages. The cards are thick enough that she can grab and chew them without them falling apart.
Grace K.★★★★★
My 2 month old actually tracks the black and white animal cards with her eyes, which surprised me since she ignores most toys. The cards are thick enough that she can grab them without crumpling, and the 20 shapes cards keep her busy during tummy time.
Zoe★★★★★
I started with just the 20 black-and-white cards during those early weeks when my daughter could barely focus, and she actually tracked them. The 60-card set breaks into stages, so now at four months she's onto the shapes and household items and still reaches for them.