Why is this even a controversial issue? Here's a link to an article on the topic that should be read by every parent, every grandparent, every educator, everyone who loves children....
I just returned from a four-day visit with a family which includes a twenty-month-old child. Even at that early age, it is so clear that free play and unrestricted (i.e., unprogrammed) access to interaction with the people around him is all-important (not to mention delightful to observe or be a part of.) The learning in such play is not something easily measured, especially at that age, but it is so absorbing and satisfying to the child that we must not discount its value! Later on, this toddler version of free play will expand to include the imaginative play described in the article linked above.
