When schools shut down in 2020, the disruption was universal, but its effects were anything but equal. The grade a child was in when classrooms closed has become one of the strongest predictors of the academic and developmental gaps families and educators are seeing today.

Educators say the impact is still reverberating, not because students aren’t trying, but because expectations haven’t always kept pace with the developmental realities of pandemic-era learning.

“The hardest-hit grade levels are the youngest grades and key transition years such as ninth grade,” Executive Director of Advocacy and Networking at Instructional Empowerment Michelle Fitzgerald told HuffPost. These were moments in a child’s school journey “where foundational skills or major identity-forming transitions were supposed to take root,” she explained, but instead were interrupted or reshaped by remote learning.

As families continue to make sense of where their children stand, experts say one message is critical: The gaps children are showing today are developmental, not moral failings. They are not rooted in laziness or lack of effort, but in the timing of the disruption.

Below is a grade-by-grade look at what was lost, and what parents need to know now.