The question is based on my personal feelings, so is probably biased and subjective.
I frequently see parents (and remember my own) encouraging their children on every trivial or regular achievement by saying a big "WOW" (and making huge eyes) for example, if child of 4 years old remembers their grandma's name.
For me, it looks like they don't even believe the child can perform such easy tasks and this is why their child is so special.
I personally remember my deep frustration when I realised that my performance was a regular one and frequently even less successful then of other children, but my parents were so "wow"-impressed, that I believed "I'm on top" and stopped developing my ideas and skills in some areas, whereas other children continued their development.
So the question is how does one give a child the correct feeling about his/her skills but not an overestimation, which actually can have negative impact on their self-image and development?