Unknown as to what exactly happened, but my husband put my daughter in her car seat buckled her and was just fine. We arrived to our destination no more than 15 minutes later and her chest clip buckle had busted apart. I do have video of the chest clip and how it was apart, however, as soon as I get the new piece and I will not have it to show due to needing the car seat. I do have video of the incident right after I noticed it and other videos showing the parts and pieces. My daughter ended up having the pieces that you press together to unlock the magnetic chest clip apart in her mouth. The magnet circle was still in the chest clip keeping it closed and locked in place. However, it very easily could have came open and out and her eat the magnet. I have contacted the manufacturer and she let me know that other car seats have had the same problem, but there is no recall. She just said she will send me a replacement piece.