The paediatric versions of the Pfizer and Moderna mRNA vaccines for Covid-19 use the same technology as their adult counterparts, but are being offered at smaller dose sizes and with a different number of shots for the youngest kids.
This is a companion discussion topic for the original entry at https://www.sciencemediacentre.co.nz/2022/06/21/covid-19-vaccines-for-kids-under-5-expert-reaction/