The sooner you start, the longer time you have to let compound interest help you along the way.
There are two vehicles - one is your state's 529 plan. This allows the money to grow tax deferred.
The second would be a low cost, high cash value life insurance policy. If it is designed correctly, it will allow you to protect your child's education if you died before you completed the plan. But more importantly, it allows you to accumulated significant cash tax deferred to pay for his education.
So I would look at both methods and see which one makes the most sense for you.
Hope this helps.