Flying during covid

My husband is in the military so we have to relocate across the country. We’re flying United and I know they fly at full capacity. I’m so nervous for my baby, she’s only 3 months old. We’re in a row with all seats booked, one of them booked by a stranger. Idk what to do, I am feeling such despair right now. We’re taking a red eye flight so at least if they’re a shitty person who refuses to wear their mask, my baby can annoy the shit out of them cus she’s got lungs on her!