Are baby bouncers safe for newborns?

Bouncer seats are generally considered safe for supervised, awake use from birth up to the manufacturer's weight limit, but Consumer Reports and pediatric guidance flag two key cautions: bouncers should never be used for sleep, and babies should always be harnessed. Specialist parenting subreddits also distinguish bouncers (safe, recline-style) from walker-style activity centers, which some pediatric physical therapists discourage.