New study claims tendencies, which pediatricians have long advised children will ‘grow out of’, are associated with more serious conditions For many in the toddler-rearing parent populationdinner-time can be a battle: their children are picky eaters, and have divined what seems like a both arbitrary and immovable set of guidelines for their foods.The foods they can’t touch, the crusts that have to be cut off or the ketchup that has to be a certain brand.