What medical conditions can cause an adult to have a child like mind?

Answer 1

Some mental conditions, like schizophrenia can make an adult think, talk and behave like a child. Another one might be severe to profound mental retardation; I've seen full grown "babies" who wear diapers, have to be bottle-fed, and some can't even sit up by themselves. And there's a kind of paraphilia {sexual deviation} called infantilism. These otherwise normal adults {the vast majority are men} have fantasies in which they want to be treated as a helpless baby. There are even "nurseries", in which {for a price $$$$}, these "adult babies" can live out their fantasies: adult-sized cribs, toys, baby clothes, diapers, a "nanny" or "mommy" that takes care of the "baby's" need, changes diapers, bathes, feeds, spanks and even punishes the "baby" for misbehaving. Want to see for yourself? Go to these links:
http://www.infantilism.org/
http://www.dailydiapers.com/
http://www.darknursery.com/

Answer 2

It can sometimes depend on the age of the adult. One of the diseases that can cause the mind of an adult to be like that of a child is dementia.

Mental illnesses such as schizophrenia (just using this as an example) can be another reason.

The person that is in this situation needs to be evaluated by the dr to see what they think is going on. Part of that may include an evaluation with a kind of psychologist called a neuropsychologist.

Answer 3

Brain trauma with resultant damage, dementia and severe mental retardation to name three.

Autism??? Wrong.