Hi D.,
Chances are your son is going to learn great at his own pace. It is not unusual for some boys to not be as interested as girls. Each kid moves at his or her own pace.
That being said I will tell a quick story of my son who is dyslexic. In preschool I couldn't even talk to him about numbers or letters without him getting frustrated. The preschool said 'no worries' for the reason I gave above. Come kindergarten he still didn't know his abc's and could not count well. Again I voiced my concerns and the kindergarten teacher said 'no worries', however the other kids new their abc's and most were reading basic words and he came home with spelling words the 2nd week of kindergarten. Already behind as he didn't know his abc's.
First grade, same 'no worries' story, me more concerned than ever, he was hating school because he was 'bored' but couldn't read at grade level no matter how hard we worked at it. He knew his abc's by then and his numbers but couldn't count by 2's as well as the other kids.
Keep in mind this is a really smart little boy. He sees and hears details around him that are truly amazing. His memory skills for verbal is well beyond grade level and his comprehension of stories read to him is many grade levels above normal however he can't read the story for himself.
2nd grade, thank goodness he had a reading specialist for a teacher. I talked to her the first day of school and told her my concerns. She kept up with his progress and came to me saying she thought he was dyslexic. A scary word but much more common than ever thought, many levels and many different forms, not just the turning around of words I always associated with it. Not only reading but math and hand coordination with writing can be part of dyslexia. He was diagnosed and started tutoring immediately with a reading specialist that teaches Wilson training, specifically for dyslexic kids. He went from reading 12 words a minute at a 2nd grade level to 72 words a minute in just 2 months. Life changing.
What all the specialist have told me is it is best to catch this as early as possible, kindergarten or first grade is best as they have not learned bad habits trying to cope with keeping up yet. My son was bored, as it turns out, because he couldn't read directions in class so couldn't do the projects or assignments.
I am by no means saying this is what is going on with your son, I just want to make you aware and informed as to what one possibility could be. I wish I had been more proactive when I was first concerned, it was 3 years before he was diagnosed and he could have been learning a lot more early on if I had followed through with my concerns. Also know that there is much knowledge out there now about dyslexia, the progress my son has shown with out side of school Wilson training is incredible, he keeps up with school now and is feeling better about himself and school.
If you want to contact me directly please feel free, I have done a lot of research and gone to conferences specifically about reading disabilities.
Again, most likely everything is as normal as can be with your son, I am not trying to scare just inform.
Good luck and have fun,
SarahMM