ur months later, yazmeen's symptoms have still not gone away.people with covid feel better within weeks. but, some develop what's called long covid, or long-haul covid, four or more weeks after their initial infection. the symptoms, first widely identified in adults, include overwhelming fatigue, brain fog, stomach pain, and difficulty breathing. >> just going up and down the stairs. when i go with walks with my family, i realize that i get winded easily, start coughing. laughing. when i-- when i see something funny, anyone tells a joke, laughing is probably the worst. i start coughing uncontrollably. >> reporter: at first, doctors told bakeya that her daughter's health wouldmprove. >> that was what i was told-- that she's young, she's healthy, she's going to be fine. just go home and wait it out. >> reporter: and at this point, people have been starting to hear about long-haul covid cases among adults. but what, at that point, did you understand about this being a phenomenon that we were seeing in children? >> nothing. and i didn't hear, i didn