VTech has appointed Siltanen & Partners as its new creative agency after a review. The company, a maker of developmental stage-based electronic products for children, also retained Horizon Media for media duties. VTech spent $15.88 million on advertising in 2014, down from $16.32 million in 2013, according to Kantar Media. The review was led externally by Stephen Boehler of the Mercer Island Group.