Baby detergent

Cara • Expecting our first baby Jan 1st 2016! Married my best friend after 8 years together 10/10/14.
Which detergent do/did you use? I was told by some people that I needed a baby safe detergent in case the baby has sensitive skin. Then others told me it was not necessary unless he has a reaction. I'm just wondering what are some types that can be said are good from experience. Any opinions?