Don’t the SH Airbus only have an extra emergency air mask for lap infants on every other row? I remember reading that on a previous thread but not sure if that only applies to the ceo aircraft or also covers the neo Airbus.

As for putting personal characteristics of fellow passengers on a seat map, I doubt it’s a path BA would want to go down. On a practical level, it could change often between selecting a seat and the day of the flight. On a moral level, it doesn’t sit right. What else could be asked for - wheelchair users? Overweight people?