BlueOnionSoft makes a few baby apps. Baby Apps All-In-One is a grouping of four of those apps into one. A great deal at 1.99 at the time of this writing. You can see in the video:
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Your child can learn about animals, numbers, sounds and shapes and then be quizzed on those items. It is fun and rewarding for you and your child. My 3 year old loves the app and probably spends at least 10 minutes at t time on the various activities.
There is a fair amount of learning potential in the app and this alone makes it worth the $1.99
You can check it out in the iTunes store here:
(iTunes Link)