Convertible car seats

Rr • Between love and hate . I choose love . Spread it even if you dont get it back.
Hi yall mamas
Do u think that convertible carseats are fine for newborns? 
I m thinking of buying just convertible car seat so it can be used after baby is grown as well.
What u recommend
As well which brand convertible seats should i consider ? 
What should be avoided in car seats.
Sorry frm here n no idea wot to buy