Unfortunately i have made the mistake that many developers have made. I have made the error of not making Toddler Time! - Spanish backwards compatible with < 4.0 devices.
I will be updating as soon as possible.
The update has added a new Professional Voice Talent to replace the old synthesised voice.
Updating to iOS 4.0 will fix the problem but only if your device is capable of running iOS 4.0.
Hope this helps.
Sorry for the inconvenience.
Thank You
Alex