My twins were always tall, and are often mistaken for 10 year olds ( they turn 7 tomorrow) DH is 6ft 4, Only time it peed me off was when they were behaving like 2 yr olds ( tanty's etc) and people commented how 4 yr olds should behave better, other than that its never been much of an issue, the only thing is now they're wearign size 10 clothes which are more "teenager" style I have trouble finding age appropriate stuff.

My 2 year old is the opposite and is tiny, and people are always saying how well developed her speech etc is, ahen its just normal.

My 4 month old is the size of a 6-7 month old, and ther is comments about this too, so I think people will always judge from their own experiences and not to worry what they say, just enjoy no matter what size you are....