Nation Pfizer vaccine won’t be ready for youngest kids for months; Supreme Court to hear Biden vaccine mandate case: Updates January 7, 2022 Celina Tebor, Claire Thornton and Karen Weintraub, USA TODAY Comments Off on Pfizer vaccine won’t be ready for youngest kids for months; Supreme Court to hear Biden vaccine mandate case: Updates Kids younger than 5 may have to wait until spring to get a Pfizer shot. The Supreme Court will hear arguments over Biden vaccine rules.