The narrow setting can be used for newborns and babies at a minimum weight of 7lbs, approximately 0-3months. The middle setting can be used for babies 3-9 months of age, and the widest setting is suitable for taller babies 9 months and older. (Please refer to page 3 of the Free-To Grow Instructions “Correct Positioning" or see below). Please note that these recommendations are guidelines and may vary depending on the height and size of the individual baby.
The width of the panel should be determined by the individual baby's comfort and leg span. The ergonomically correct position for baby is to be positioned with the base of the carrier supporting them from knee to knee, with their knees slightly higher than their bottom in an "M" shaped position. When choosing which seat width to use with your baby, choose the width that supports their legs in an "M" shaped position with their legs supported to the crease of the knee. If the edge of the panel rests on the baby's calves, rather than under the bend in their knees, then the width you have chosen is too wide. Always ensure proper placement of baby in the carrier including leg placement.