We use huggies disposable nappies and for the majority of the time they are great.

Until she poos in the car - then we have MAJOR leakage issues every time - all through her clothes etc. I know this is partly due to her possie in her car seat and the fact that the seat belt between her legs etc. forcing the poo up but am wondering if I could use plastic or cloth pilchers (sp?) over the top of the nappies to stop the leakage. It goes up her back and pushes out through her legs.
Has anyone had this problem with their nappies and any solutions would be appreciated.

TIA