I agree, try to get a diagnosis and work with a healthcare professional on doing this. You can look into holistic practitioners if you want to avoid giving your child drugs (understandable).
You really want to be careful with cleansing at this young. I realize that parasites are bad, but Herxheimer reactions can be brutal. If you don't know the right dosage to start out at, you could flood your baby's body with more toxins than it can handle. And if it turns out that something else is the problem, then you'll have taken the risk for nothing.
It may be better to just make sure your baby has the healthiest diet possible for now. Probiotics are a good idea. Give his body the best tools to fight any problems.
this is just a moment in time, step aside and let it happen