FIL advice

I'm 14 weeks.  My father-in-law (who knows I'm pregnant) keeps making comments like, "hey, could you suck that in? You're letting it all hang out."  (Referring to my growing bump) Or "cut back on the food, you're kinda bulging out there."  And I know he thinks he is being funny, but I'm really not amused...not to mention I'm feeling insecure since I'm pudgier. I started showing about two weeks ago and don't really fit my clothes anymore. *sigh* any advice on how to get him to stop?