Depending on what you're looking for, you might also consider PhonBank, which contains orthography and IPA transcriptions of a child's target and actual utterances. You can find a link to this on the CHILDES website (http://childes.psy.cmu.edu/phon/). These can be used with Phon (https://www.phon.ca/phontrac/wiki/Downloads), a software created for child language research and particularly useful for phonological analysis.