- This 2 in 1 highchair friends follows baby's growth from 6 months to 3 years of age. when the child is 6 months old, it is a comfortable and safe highchair, ideal for the weaning period. then, when the child is learning to eat independently, the upper seat insert can be removed, the activity tray detached and polly becomes your child's first chair. what makes it that much more special is that the child can sit at the table with mom and dad.