"Anorectal malformation" is a bit vague. This can mean anything from an abnormally narrow anal canal to a complete lack of anus and the associated musculature. Most malformations are somewhere in between: the rectum did not quite make it to the anal canal during development, and instead is connected to the vagina, or bladder, etc.
If the anus is merely narrow, or merely slightly displaced (meaning that the rectum didn't quite "hit the target" and emerge in exactly within the sphinchter muscles) there are non-surgical options.
But these circumstances are rare. Most problems do require surgery. And there ARE minimally invasive options.
Why weren't VATER related questions asked? Why wasn't the VATER diagnosis described? This is a very incomplete anser at best.
Susan Kramer
Mother of a healthy ten year old with anal rectal malformation as well as several other diagnoses that the extremely good surgeons knew to look for ten years ago.