reversals are VERY VERY common with K and even some first graders who haven't done a lot of reading and writing.
Where a sentence starts and the notion of reverse sweep would be a start for this child (and lots of K students).......model it during read aloud, interactive writing, and guided reading group. Thats why he is at school, to learn that from you.
The name, numbers, and letters will come around with practice and expirence. Don't even mention the b/d reversals--still see 2nd graders doing this!
I do think it is unfair to the parent to worry about this and start putting labels lke dyslexia. This child just started K! Have mom do fun things with him, like make letters in shaving cream with his finger. Have her put to each word as she reads to him and involve him..."where should I start reading the story from? "Good try, we always start here though..take his finger and move it.