In the "shrinking machine study", researchers demonstrated that

The shrinking machine study was conducted by Simcock and Hayne in 2002.
In the "shrinking machine study", researchers demonstrated that children could have procedural memory and visual recognition memory for events they could not explicitly recall.
 They showed that 3-year-olds were unable to use newly acquired words to describe a "magic" event experienced 6 or 12 months earlier.