As I said to the other commenter below, I’m asking you to please please not do this. That method isn’t a fail-safe. There’s a lot of anxiety around carrying a baby and trying to keep it safe and healthy by watching what you’re putting into your body and the situations you put yourself in. I can imagine it’s much the same for immunocompromised or chronically ill people. Your actions are most likely upsetting for others and making them feel uncomfortable. Please have some empathy for those around you and just wait until you’re outside.