When you have several children from the same family, all baptised on the same day (quite common for Wesleyans) and it's the earliest date you have for their existence, you put that date in the birthdate field and click the "before this date" radio button. That scenario is quite common, as is two children baptised only a few months apart, where the same button is selected. In these cases, the data is not suspect. I just end up having to ignore the red flag, because I know I was rigorous.