I know pretty much zip about car seats, since we dont own a car or really drive. We registered for the diono radian to use for car rentals, vacations, etc.

My mom has been buying stuff that she hopes to use for my son (who will be two when he arrives) and my sister's future hypothetical baby.

She got a great deal on this stroller that has a detachable infant car seat. It will be way too small for my son. I think what she needs is a convertible car seat that goes from toddler to booster seat. She saw one at target for $40 but i feel woefully uneducated on this subject. Help?