Kuhn is part of what Lee Briante, a spokesman for Greasecar, the largest purveyor of veggie fuel conversion kits, says is a growing market segment.

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Many makers sell optional conversion kits costing as much as a couple hundred dollars, which turn the crib into a toddler bed, often partially surrounded by rails and low enough to get in and out of without help.

WSJ: Manufacturers Discuss Safety Features of the 'Modern' Crib