Convertible car seat?

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So as of now I have the stoke stroller and Nuna/stoke infant car seat for my baby girl. However she has reached the limits for her infant car seat AND I found out I’m pregnant with baby #2!

This time around, I want something cheaper and more practical for 2 babies. And I also would like to get a convertible car seat for my firstborn.

Should I get the evenflo Xpand double stroller (that comes with an infant car seat) and then get an evenflo convertible car seat or could the convertible car seat be different from the double stroller ? Any recommendations ? I’m so new to this thank you !