The thousands of images of Fisher-Price’s Rock ’n Play sleeper posted on Instagram include many of babies snuggled serenely in the cloth-covered cradle, free of its harness and surrounded by blankets and stuffed animals.

To sleep-starved parents, the photos and videos seemed to underscore the Rock ’n Play’s ability to lull fussy infants into a peaceful slumber. But the posts also suggest something else: that the risks long associated with the sleeper did not register with many consumers.

Doctors, safety groups and now several lawsuits say Fisher-Price and its parent company, Mattel, should have done more to fix that.

[Some day cares used dangerous infant sleeper after it was recalled.]

When Fisher-Price agreed last week to recall all 4.7 million Rock ’n Plays on the market, it said it was not at fault for the more than 30 infant deaths the Consumer Product Safety Commission had linked to the sleeper.