Well, quite. A cleft palate that heals itself before people's very eyes, later examined by qualified medical practitioners in a hospital? This would be the front-page and top story of every newspaper and every TV news programme around the world. Facebook and Twitter and all the rest would be ablaze.
I Googled "Eleanor Mumford" and "cleft palate" and guess what result came up? I don't mind giving you extra time to think about it.
When you make shit like this up, you have to remember to keep it incredibly vague ("I heard ..." or "I remember reading once somewhere ...") and so light on detail that it's almost entirely detail-free. Unfortunately Alan forgot this and mentioned (a) somebody already well-known within her own rather limited circle and related to somebody even more famous and (b) a hospital where this baby was supposedly examined. Well, which hospital, where? Hospitals can be contacted; doctors, nurses and surgeons (etc.) can be traced and spoken to even if they've moved on to other hospitals or have retired. (Although, having said that, Alan alleges that this supposed event was "recent," which would make it even easier to investigate). People can be asked directly: did this state of affairs ever take place?
What I'm getting at is that there are ways and means of corroborating such stories, or rather of disconfirming them.
But of course you and I both know that for precisely that reason we're not going to get anything of the kind.
We never do.
Ever.