Great app

It is an lovely app designed just right for my young one. Everything works impeccablely. Also just saw the post of no sound, here is my 2 cent as i encountered that with other apps before, that is why i used to solve this iOS issue (not app issue):

if using iOS 4.3 or above (See Settings > General > Version, for iOS version number)
Make sure the orange dot is not showing on the "Side Switch" on the upper-right corner of the iPad.
Go to Settings > General > Use Side Switch to: > Check Mute
Open the app, and the sound should now be working.

If still not working, just restart your iPad, it should work.

FHL6789 about Toddler Counting 123 - Lite