I don't understand the question. Babies don't use computers. Toddlers don't need them and should generally only watch some videos carefully chosen by their care

I don't understand the question. Babies don't use computers. Toddlers don't need them and should generally only watch some videos carefully chosen by their carers under supervision for a very limited time per day (smartphones and tablets don't belong in a toddler's hands at all). You've got at least five or six years before actually using a computer may become interesting and valuable (rather than just harmful to their development) depending on the child. I take it your question is about introducing a six year old (or thereabouts) to general purpose computers and programming?