"Of course there is no vaccine approved for under 12 year olds"
Not yet, but it appears that there soon will be as extended lock downs are simply not sustainable and as stated in its latest report filed in the US Moderna disclosed information about a number of planned trials, including one in around 6,000 children aged between six months and 12 years old;
"The 204 study is a Phase 2/3, randomized, observer-blind, placebo controlled, study to evaluate the safety, reactogenicity, and effectiveness of mRNA-1273 SARS-CoV-2 vaccine in approximately 6,000 healthy children 6 months to < 12 years of age. Approximately 6,000 participants will be enrolled in a dose-escalation, age de-escalation design testing 50 and 100 ug dose levels across three age groups: 6 to <12 years of age, 2 to <6 years of age and 6 month to <2 years of age. Safety and Immunogenicity endpoints will follow the P203. The study will enroll in the US and up to two ex-US countries (e.g. Canada and/or Australia)." - AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT
Given that the Delta variant has pretty much killed the 70% herd immunity dream the above may be indicative of plans for maximum coverage to get us out of this mess?
