A beautifully-designed chart of the three major classes of phonological changes that happen in children's speech. This includes more than we tackled in class, alongside some ages at which the processes typically stop occurring. (If they're persistent, you might hire an expert linguist -- like yourselves! -- to help iron them out: you may not appreciate sounding 'cute'.)
http://mommyspeechtherapy.com/wp-content/downloads/forms/phonological_processes.pdf