The Infant-thingy MUST be used with the Foonf and Fllo until children reach a minimum of 14 lb, 25", and can sit upright unassisted.
It can, however, continue to be used by children weighing up to 22 lb and measuring up to 33" until they meet the convertible seat's developmental requirement.
If child is above 22 lb but remains under 33" and is not yet able to sit upright unassisted:
- You may continue using ONLY the Infant-thingy head support until they meet the convertible seat's developmental requirement.
- OR until they exceed 33".
- OR until the top of the child's head is above the head support in its highest position.