As mentioned, a child needs to be able to speak and understand the languages before he or she can read in them. However, you can read to your child from an early age to develop an interest in books.
Get plenty of well-illustrated books in both the first and second languages, and keep them around within easy reach so your child can peruse them at any time. Set aside ten or twenty minutes everyday to read together in both languages. Read aloud while pointing to each word you read. This will help your child to make the connection between the spoken word and the written word, and also to understand in which direction the script is written (left to right, or, in a language like Arabic, right to left). Read clearly and slowly. With a well-familiar book, you can pause at certain words and encourage your child to fill in the gaps. Along with reading books from your child's learning level, it is also a good idea to read from books that are slightly above his or her learning level to expand your child's scope further.
Continue reading together even after the child has mastered reading. Ask him or her to read out loud to you, or to visiting guests. This will develop reading as well as presentation skills. Be sure to applaud enthusiastically after a good reading.
Apart from reading books, you can read street signs, shop signs, food package signs and so on. If you live in the region of the first language, these will be in the first language. In this case, and if possible, you can consider taking your holidays or having your child spend vacations with relatives/friends in the region of the second language.