I have a bit of a different experience with this. It's in no way to worry you, but wanted to share my child's past. My now 7 year old had a very difficult time learning his ABCs and 123s, could barely write his name leaving preschool(just Ben, never mind Benjamin), etc. I had concerns as well, because these were things that I was shocked he wasn't picking up. I had voiced my concerns to his ped, his preschool teacher both years at 3 and 4, as well as his kindergarden teacher. Every single one of them had told me basically 'he is fine', 'he's a boy', and 'don't worry'. I shold say he went to a private kindergarden since our public was just a couple of hours and I had a newborn, and wanted him in school all day.
Anyway, he just finished 1st grade, at the public school, and is getting ready to go into second. It was like a brick had been slammed in front of me at teacher conferences. His 1st grade teacher had many concerns. Finally, an educator who was seeing what I was seeing...but why did it take until now?! He started 1st grade so far behind, and has worked really really hard, but is still about a half grade level behind.
I have done a lot of reading and research on reading disabilities, and have been shocked to find that he very well did in fact exhibit many many of the characteristics, but none of the educators, including his physician knew that all of my concerns were indeed signs of a reading disorder. Many start to show at the preschool age, but by the time it is picked up it is usually pretty late...can be as late as 3rd grade.
I say all of this not to make you worry, but because it *can* but doesn't *always* point in that direction. If any of the educators up until that point had known about this, I could have saved my son a lot of trouble, and he could have begun learning in the way best suited for his brain. Now i am in the process of hiring a tutor for him to teach him in a special way to the tune of 35-75$/hr
He too is extremely bright, comes from a family of very well educated people, some of which have very high level IQs, and I *never* thought it would happen to my child. I learned to read before I turned 3, so it was so surprising to me.
Anyway, you got some great advice already....I just wanted to give another perspective for you to keep in your mind, just in case in the months ahead, he is still having trouble. CHances are it's all fine, but I wouldn't want another parent to go through what we are going through now, if at all possible.