How much ipad time do you think is OK for a preschooler? My boy has learnt a lot about topics that interest him such as dinosaurs through YouTube videos. I'm just thinking whether is it causing more harm than good?

Here's a rather comprehensive (but quite lengthy) article on the amount of screen time for children: http://www.pcadvisor.co.uk/feature/digital-home/how-much-screen-time-is-healthy-for-children-benefits-3520917/ Personally, I feel that there are benefits of allowing your child to learn about things on his own from the internet. Still, it will be good to be more hands-on for young children. Learning through play can help develop abstract and conceptual thinking. These are different from learning via videos and ipad games. In all, it is back to having everything in moderation to reap the benefits of all options. :)