It is possible that the main title of the report Marfan Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
As Jenny points out, being able to lisp the alphabet song at age two has little to do with 'knowing' the alphabet. And, yes, most children learn the letters by sight and sound in kindergarten, although most are capable of learning this information sooner if diligently taught by parents or others.
Ages 6-10: learning to read. Kids learn to: read simple books by mid-first grade and know about 100 common words. understand that letters represent sounds, which form words, by mid-first grade. enjoy a variety of types of stories and talk about characters, settings and events.