How many car seats suggested?

Du

I added 2 car seats on our baby registry. They are 3-in-1 and can be used from infant to toddler to little kid. I added 2 so that it wouldn’t be a hassle to swap between my car and my husband’s for the next 5+ years. I’m wondering if 2 is good... the infant setting is only useful for about the first 6 months or so.

Should I just have one car seat to start with and take one away from the registry? Is it worth it to ask for 2?

*update: thanks all for the info/knowledge! I didn’t know all that before but I see now, we don’t need a base for ours so we’ll go with the 2 convertible ones 🤗