>"It's been more than a year since adults first got Covid-19 vaccines, but about 18 million children under 5 in the US are still waiting -- and will probably have to wait until the summer, despite some predictions that shots would be available in the first part of 2022. While Moderna has shared some data on two doses of Covid-19 vaccine for younger children, Pfizer and BioNTech's data on three doses for younger children is not yet available."