to promote best trunk and posture development
I am not reviewing the car seats safety performance. This is a review of the seats support from the point of view of gross motor development, spinal alignment and fine motor development.
Any of these are great car seats to support your child after she learned to sit independently. They have great head and trunk support and they are adjustable supports.
I do not recommend to use them for newborns and infants who can not sit independently on the floor for 10 minutes. I recommend using infant car seats for the very young babies.