My #1 was 5-7 at the beginning of first grade, so same age difference, and likewise small for age. And in a class with some mighty tall kids (some taller than I while still in elementary--although that's not perhaps saying all that much!). (Skipped K, so can't speak specifically to that.) We did not have a lot of difficulty with friends, or even being the class pet, but this is our raging extrovert child, so that might be more of a factor than age difference. 1 has historically, and continues to be, more drawn to kids a year or two older.
