Re: hemp help??
If the insert was new, it needs to be prepped. It should be washed on on hot for several washes (3+) to wash out the natural oils and maximize the absorbancy. After it has been prepped, it does not require any different care. If it is your only hemp, you could boil then rinse it several times.
He may be reacting the the hemp oils or the urine is not soaking in as fast, so it is staying on his skin for longer, which can cause rash. I hope you figure it out soon.