Why are sharp zipper edges a risk on children's clothing?

Q: Why are sharp zipper edges a risk on children's clothing? Sharp edges on a slider, puller or stop can scratch skin and, on young children, become a pinch or cut point. They are treated as a critical defect in most inspection schemes, so the response is to hold the lot rather than sort it later. Run a finger or a soft cloth along every exposed edge of the slider and puller. Check the slider ends and the puller attachment for flash, burrs or a sharp mould line. Inspect stamps and cut edges of metal parts, which often carry a burr. Compare against the maker's approved sample by touch and under low magnification. Record any sharp edge with a photograph and the position on the part. Any sharp edge on childrenswear should be treated as critical and the lot held. A single burr from a worn tool can affect a whole production run, so the maker should check the tool as well as the parts. A touch check at incoming inspection catches most of these before cutting begins.