Puzzles games are an excellent learning tool for young children and toddlers as they help develop many mental learning advantages, opportunities, and skills. Problem-solving, cognitive skills, hand-to-eye coordination, fine motor development, social and self-esteem being just some of the basic ones. And while every child is different, usually most of them are ready to give puzzles a try once they turn 1.
Source: http://www.righttimetobuy.com.au/right-time-to-buy-right-jigsaw-puzzle-for-your-kid/