As a father of two young children, I kept them away from computers and screens as much as possible until they were 3 years old.
Babies are wired to be learning about and interacting with their physical environment and the lifeforms around them. Exposing them to highly artificial and abstract phenomena before they have developed the abstract thought processes to assign relevance and meaning to them seems to be at best at waste of hard earned neural circuitry, at worst developmentally damaging.
We need to be gently nurturing our children's imaginations not flattening it and rendering it obsolete via technology. There's plenty of time for kids to discover computers, but once they do other all the other things they love doing will have some serious competition for their attention.