Not till four

Disclaimer- I know I’m not mainstream on this one.  If I’m driving you crazy on this but other parts of this site are helpful, please let it slide.  

As useful as technology is, using screens for kids under four is going to hurt more than it helps. Teaching reading, mathematics, science and other subjects can all be done very well in a more hands on, tactile and relational way without creating unhealthy synapse and changing the way the brain develops.