Great idea but needs a lock feature

My 8 month old loves this app and its a great idea. The problem is that he can easily close the app by squishing his fingers together on the screen. He can also and often pull down the notifications centre. This means I have to restart the app often, sometimes after just a few seconds. So, for this to get the five stars I think it otherwise deserves, there needs to be a parental lock or something similar to stop kids from being able to easily shut the app off. There may be Apple-imposed limitations around this, but if not, this is a necessity for this app to work.

Brazenllama about Baby's Musical Hands, v1.2