iNepali Lite - a FREE Nepali language learning iphone application is available in app store,
here is the link for your reference http://itunes.apple.com/us/app/inepali-lite-1-1/id433310447?mt=8&ls=1 or search on your iphone using 'iNepali' keywords.

This is first iphone application for Nepalese kids or anyone who want to learn basic nepali letters on mobile device such as iPhone/iPad. In this version, it includes basic Nepali alphabets (Consonants, Vowels and Number) with picture card, also include Barkhari which is assumed as a hub of Nepali language, where you can build many words simply picking and putting them together. Lets give a chance to your kids learn and pronounced correctly.
 
There is also some Nepali Bal Geets streamed form the internet and interesting game. Have a fun!

 New version updated, added many more features. 
Grab it now for your kids. They will love it.

 I think you should download all other language teaching apps from the store, go thru them and work on it again. just personal thought