How are new words learnt?
Children learn new words when they can link them to words or concepts they already know. This is how they learnt their first language and this is how they will learn every other language. The only difference is that subsequent languages are learnt quicker and more easily (that is if the child wants to). The learning of new words, thus, proceeds as follows:
There is no hurry for books (textbooks or any other. The only exceptions are
wordless picture books). Words and sentence-patterns are fixed first by listening
and then speaking. Reading and writing come later.