For many parents of young kids, the news that Pfizer and BioNTech are seeking emergency-use authorization for a coronavirus vaccine for children younger than 5 couldn’t have come soon enough. What we know — and don’t know — at this point in the process. Read more:Earlier this week, The Washington Post reported that coronavirus vaccines for children younger than 5 could be available far sooner than expected — perhaps by the end of February — under a plan that would lead to the potential authorization of a two-shot regimen in the coming weeks.There are still a lot of unanswered questions about the regulatory strategy here, says science reporter Carolyn Y. Johnson. But for parents of young children, this news may feel like a light at the end of the tunnel.