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.
1 Understanding simple words â You should be concerned if your child does not understand the words no, bye-bye, and bottle (if appropriate) by the age 15 months. 2  Vocabulary â Your child should use single words by 15 to 16 months of age at the latest. 3  They should have a 10 word vocabulary by 18 months of age.