I think the biting/soiling himself is an extreme reaction to seeing a child 12 feet away! I've never heard of or seen such a thing happen. A fearful dog is a dangerous dog and your guy is just a little pup! I don't think he is aggressive - just fearful. If you were carrying him, that would explain the bite. An animal in fear or over excited will bite anything nearby (even a loved one). You need to build his confidence and control his attention. You use a sling (to carry him)? Don't. He needs to walk, explore and build confidence!
First, get yourself a light metal chain leash (not a heavy one).
Next, make sure he is wearing a collar and/or harness he cannot get out of - these guys can be like a houdini contortionist and you want to prevent his escape at all cost! If you have to use both a collar and a harness, do it. I recommend a martingale collar in addition to a harness. Use 2 leashes if you have to. Keep your eyes on him every second when he is on leash and you are outside. I keep my basenji in front of me - it's when he is behind me and starts to back up that he can get out of his collar/harness.
Next, desensitize him to whatever freaks him out. Go to a playground - stay far away and work your way closer SLOWLY and preferably with another dog who is older and very calm who can be a good example for your little guy. Or sign up for a puppy obedience class where there will be a couple of kids. Let the instructor know about the problem. Your pup will be distracted by the other pups and they will be a good example to show him there's no reason to melt down.
Always have treats to give to other people to give to Pharaoh so he will learn that strangers (big and little) are a good thing. Also, work with him on "Look at Me!" in a happy voice when you give him treats and put his food down - if you can get him to focus on you rather than whatever is "bothering" him, it could help in a scary situation.
You need to build Pharaoh's confidence up.
I support spaying and neutering. It can be kinder. My friend has a wonderful and well mannered Arabian stallion. I feel sorry for him that he can never be with other horses.