those are the ones who are getting hospitalized and doing poorly. >> america's largest pediatric hospital has staggering numbers of children that are coming in with covid. that's according to a pediatrician at texas chuildrens hospital. my colleague miguel marquez was there. >> reporter: 4-month-old grayson perry, his tiny belly rapidly contracting and expanding, one of many children here with covid-19 struggling to breathe. are you afraid they're going to have to intubate him? >> yeah, a little bit. it's just really scary. so i just hope that, you know, he's able to get better and go home. >> reporter: she thinks her youngest picked up the virus at a christmas family gathering. her only job now, keeping her son in good spirits. >> so dr. mccain, it is heartbreaking to see. why are we seeing a spike in