This is a very figurative Psalm. You can’t take every word literally. For instant, babies don’t speak lies as soon as they are born—they don’t speak at all! This is an expression, along with the rest of the Psalm, just used to show how wicked some people are. We say some of the same kind of things when we say someone was born with a silver spoon in their mouth . Or, “He was born in the objective case” because he objects to everything. Or we might say, he was born a liar. We don’t mean these things LITERALLY! If your interpretation of a scripture contradicts another scripture (Ezekiel 18) then your interpretation is wrong. The Bible does not contradict itself.