Who should buy the Graco Nautilus? Anyone who is looking for a Car Seat at a great price that will cover a very wide age range and keep you from having to buy a bunch of different car seats should buy the Nautilus. One thing you do have to watch out for and we highly recommend researching is the fit for your child with this car seat. Don’t think that just because one factor like weight or age by itself makes you kid compatible with Nautilus 3 in 1. Your child needs to be within the age, height, AND weight limits in each of the 3 modes to use the seat correctly. You also want to make sure it is in the correct mode. While saving money is nice, and you CAN save money by purchasing the Nautilus Booster, your child’s safety is way more important. Take the time to learn the safety and installation facts for this car seat and others!