My son's bottom is so red :(

My poor little guy, lately he gets really red after poops. We've been using "Butt Paste" Since Desitin didn't work to well. Now it seems the paste isn't helping either :( Any suggestions?

    My guess is he's allergic to something. has he been trying new food this week? Or do you have a different brand of diapers?
    About Jennifer Lucas
    Current: San Mateo, California
    Birth: September 12
    On since: Apr 6, 2014
    I am a Christian, SAHM. We live in California. Married since 2011. Our Son (Benjamin) born in 2013.Daughter Audrey is due January 2016.,