Nation Pfizer COVID-19 shot won’t be ready for youngest kids for months: ‘Might be a three-dose vaccine’ January 6, 2022Karen Weintraub, USA TODAYComments Off on Pfizer COVID-19 shot won’t be ready for youngest kids for months: ‘Might be a three-dose vaccine’ The lower dose given to 2- to 5-year-olds hasn't produced the necessary immune protection in early tests, according to Pfizer.