As a child, I grew up Mormon, when I was 7ish a family moved into our ward that had an 11-year-old named Eric. The Relief Society asked for sisters who could help the new sister with her handicapped son. My mother was one of the sisters who offered so we’d go to the Coombs house 3 times a week to help her with her son. The first time I was just told he was born with water on his brain so even though he was 11 he didn’t act like it. Boy, that was the understatement of the year! Even at 11, he was just a little bigger than me at 7 and behaved like an 8-month-old baby. He couldn’t sit up on his own or talk or any of that stuff. He was dressed, fed, and treated like a baby, which makes since he only had the mental capacity of a baby. Later I learned he was born with severe hydrocephalus, and the doctors told his parents he probably would live past 1 or 2. The doctors later revised that to 4-5 then basically said he was on borrowed time. Anyway for the next 3 years, we go over to help with Eric always in the evening as he had a weird sleep schedule. My dad was on a graveyard shift at the time and with me being homeschooled due to my disabilities, it wasn’t a big deal for us to help her from 4 pm to 2 am when Eric was most active. By the third year, my dad was sick of graveyards and the boring job he had. So he got a new job and we moved to a new city about 200 miles away. Eric had started to slow down a bit and was sleeping more just before we moved away. Sadly he passed away for a few months before his 16th birthday. Anyway sorry for the long story but severe hydrocephalus can make a person behave like a baby, though they may not live very long.