No. When used correctly, the seat belt will still fit snugly when using the Tummy Shield only the belt will be redirected from the abdomen to the upper thigh area.
The Tummy Shield’s internal stainless steel components, including the “anchor” that directly holds the lap portion of the seat belt on the legs/lower pelvis and off the abdomen, were all designed to conform Australian Design Rule 5/04 – Anchorages for Seat Belts. The structural integrity has been validated using a static test of 22,000N.
What this means is that the structural components of the Tummy Shield meet or exceed the same testing standard that regulates the seat belt anchoring hardware in motor vehicles. All load testing requirements for seat belt assembly performance under United States Federal Motor Vehicle Safety Standard 209 are less than the 22,000N the Tummy Shield was tested with.