Here are some sites that will provide more information and sites for your child to practice.
Phonemic awareness
Phonemic awareness is the ability to notice, think about, and work with the individual sounds in spoken words. An example of how beginning readers show us they have phonemic awareness is combining or blending the separate sounds of a word to say the word ("/c/ /a/ /t/ - cat.")
http://www.readingrockets.org/helping/target/phonologicalphonemic
http://pbskids.org/island/preview/games-phonemicawareness.html