Car seats are difficult to recycle, due to the many different materials that are stuck together. If you have the will, time and patience, deconstructing it is worth the effort.
discard soft plastic padding and small plastic pieces in the trash
place cloth straps and any other cloth parts in a textile donation bin
remove metal parts and place in a scrap metal bin (not with your curbside cans and bottles)
the plastic shell may be recycled with large rigid plastics, which are collected at annual Recycling Days by some towns, and year round at the Kingston Transfer Station.
Charities and thrift stores are prohibited by law from accepting used cars dseats for donation.