Most of the rugs are made of a polypropylene material which is considered safe for kids of all ages. Babies should be watched closely if placed on the rugs with the thicker plush because they may try to eat the fibers and choke on them. Toddlers and little kids should be safe on any of the rugs by themselves. Most of the rugs come with backing to keep them from slipping on hard surfaces, so there should be no concern about falls.