Grown men argued over dolls for six hours as they wrapped up a federal trial pitting the maker of the pouty-lipped Bratz dolls against the house of Barbie — a lawsuit that could cost upstart MGA Entertainment Inc. up to $2 billion.

Millions of dollars are at stake in Mattel Inc.‘s copyright infringement case, but in the trial’s final hours lawyers instead asked jurors to think like children and sparred over the placement of beauty moles and the plumpness of glossy, heart-shaped lips.