Convertible car seat or infant car seat?

Co

I am a thrifty woman. I have to be considering we'll have 4 kids in the house soon. For my two, I used cheap infant car seats that were probably unsafe looking back. This time I was considering a convertible car seat. I know you have to be careful with those because some just don't fit newborns, but I was wondering, have any of you used convertible car seats for your newborns and how did they work? Or did you just use an infant car seat and get another car seat later?

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