My pup keeps on whining and yelping when put outside the house

First I have to ask, the puppy is only one month old? Normally they are with their mother until 6 - 8 weeks old. He is having seperation anxiety for one, that young they are not used to being left alone. The best thing to do would be to go out there with him, once he figures out that you are staying he will probably take care of business.

Try taking th edog out for a walk (not just puttinghim outside by himself) before you feed him. Let him do his business before you feed him and allow him to curl up and take a nap after he fills his belly. After an hour or two, then take him outside again for a potty. Never feed your dog with out exercise first. Also, since this is a pup, go outside with him. Make it fun. Run and play with him. Don't just plunk him outside and shut the door as you reamin inside. Dogs are social animals and would much rather have interaction that being plopped outside, alone as you, his leader go back indoors, without him.