I think there is a general misconception about LDN and treating only mild cases with it.
The initial Penn State study only used subjects with mild to moderate disease in their trial. I mean, would you ask someone with severe disease to volunteer when it means they would have to come off all other medications? A very big gamble for them to take.
I had a severe case. To illustrate how bad it was, just take a look at the internal scarring photos I posted... the disease did that to me in less than 3 months... plus mine was a rare combo of Crohns and Ulcerative colitis. Spread like wildfire. When I started LDN the only other medication I was on was 5-ASA. I'd been taking it for a couple of years and it did absolutely nothing... but at least it was (although I 'believe' it no longer is) approved for treating IBD. Despite the severity of my case, LDN stopped both in their tracks in less than 3 months. So, you CAN treat severe IBD with LDN... you just have to be extremely brave, extremely foolish, or extremely desperate to try it... and to tuff out the startup.
As for the risks of using it on children... I can't provide anyone with a pat answer there. I know that... when it comes to children... the 'fear' of what might happen to them is a real thing. It may look like an intangible, but it is real. Is there a possible issue? I don't know.
I DO know that one of the fundamental, primary reasons I gladly played lab rat with LDN was my fear that my children might develop this disease... AND the 'known' side effects of the other meds that doctors might use on my children scared the living daylights out of me. Hell, it scared me when they wanted to use them on me... I know first hand what the consequences of those side effects CAN be. Believe me, you do not want your kids to go thru what I went thru...
All I can tell you is... LDN does work with severe cases. I have been using full strength LDN for 6 years now... every night... and zero nasty side effects to talk about. I would suggest to anyone.... look at the 'known' risks of the various meds... make your choice based on what you know... AND if someone (anyone) suggests you fear what isn't known, then that basically boils down to just plain fear mongering. There is no science behind it.