In the Harry Potter series, lots of Muggle parents are introduced to the wizarding world because of their magical children. This is seen with Hermione's parents visiting Diagon Alley and various other moments.
In the 1920s USA world that has been created, rules about fraternising with No-Majs are very strict. Is there any evidence in any of the Pottermore articles or recently published film tie-ins which explain what happens with magical children born to No-Majs around this time? (Clearly certain events in the film suggest that they may have no procedure and that there can be side-effects of this - but I feel that those events must be rare!)