I shave the hair in the area of my body covered by diapers, urine, and feces.
It isn't to feel more like a baby, but for the sake of hygiene. It is easier to keep clean and odor-free when there isn't so much hair down there.
Remember to use lotion down there to keep the skin soft, moisturized, and fresh.
Use a protective cream to shield the skin from bacterial issues caused by what ends up in the diaper.