Do I need to replace the Infant-thingy if involved in a collision? February 06, 2020 20:18 Updated You will need to replace the Infant-thingy after a crash ONLY if it was occupied at the time of the collision. Related articles How do I clean and care for my Infant-thingy insert? Has the Infant-thingy been crash tested? Should I continue using my seat if it's involved in a collision? Can I use both the car seat headrest and Infant-thingy head support at the same time? Can I use the Mat-Thingy underneath any brand car seat? Comments 0 comments Article is closed for comments.