How to handle disappointing freshman grades?

<p>My son had disappointing grades his first semester, got a D- in Philosophy, which put him on academic probation, and only allowed him to proceed with 12 credits this semester. He appealed, and actually was allowed to go back to taking 15 credits. My question is, should he retake it in the summer, even though it is passing? I don’t believe his major need’s a masters degree, so should we just move along? Hopefully he has had a wake up call, and puts academics before social. He loves his university.</p>