Lauryn Hill -- Rohan Marley Did Not Abandon Me

Lauryn Hill has posted a statement on her website blasting reports that Bob Marley's son Rohan "abandoned" her during her recent pregnancy -- and hints that he's not even the man who impregnated her ... this time.

In her post, Hill admits, "Mr. Marley and I have had a very complex history" ... and mentions they already have FIVE children together.

Hill states, "[Rohan and I] have had long periods of separation over the years but our 5 children together remain a joy to both of us." The fact that she says they only have 5 kids and not 6 suggests Rohan is not the father this time ... though she never explicitly rules him out.

Hill never reveals the identity of the new baby daddy -- but says, "Mr. Marley did not abandon me while pregnant with his child."

"Thank you for your concern and I appreciate all of the well-wishes regarding the birth of my new son."