Is there a Way to lock apps or disable the home button?

I often allow my 16 month old to play toddler games on my iPhone. He knows how to slide his finger to unlock the phone and he loves pressing and holding the home button to activate Siri so he can talk to her! LOL! I am worried that he will accidently delete or move an app to another screen by accident so is there a way to prevent that from happening. Also while he plays his games, he likes to press the home button which closes him out of his game. Is there a way to disable the home button so he can just stay within his toddler games?