2 in 1 car seat is most suitable for babies from 9 months mainly because it’s back can not recline hence wants a baby already seating on their own.One its best advantages is that in  the fure the seat can be simplified by deatching the  back and use the seating part as a booster seat without the back.Supports baby 0-36 kgs and baby from 9 monts to 12 years.