Schools were closed so much because
primary age never wore maks in uk. ( other countries did and had kids in more during the pandemic)
Current y3 missed jan-mar 21 so over 1/6 of reception
And mar -jun+ nursery
Y4 mar-jun? Missed Reception 2020
And jan-mar 8w y1
Y2 missed no school but some nursery possibly
Certainly my dc also missed several more weeks of whole class isolations.
Plus dc2 reception class missed 30+ min per day thw whole year -- this works out as weeks less altogether
In terms of younger year groups
the nhs was frankly quite crap (locally) 8years ago and dc i know of werent getting s&l etc it was all wait and see. Kids still in 2015 started school with severe issue related to asd one repeated reception then moved to a special school. The other repeated got a diagnosis in maybe y2 and has moved to special school for secondary.
Children struggling in reception 2016 got bounced bacl from diagnosis and now with the waot lists have been waiting 2yrs after peads referral.
Our school in 2020 reception said they had issues with speech - all the kids i knew were completely fine ( but there was a huge increase in bilingual kids at this school that year from 1/60 say to maybe 8 or 9. )
The recovery curriculum didnt help as delayed the start of usual work.
By sept 2020 people were taking kids to park meet ups and kids were playing together.
Some kids are more passive than others which impacts language aquisition.
My dc1 asd/adhd referral was so 'naughty' into absolutely everything her language was pretty amazing by 18m. And always clear. She demanded constant interaction.
A boy born that same week spoke several month later would sit in front of tv placidly.
But also his parents put him to bed very early - before his dad got home so missing all that interaction. Basically loads of factors including infections etc.
Blaming s&l issues in 4yo on covid may mean fewer interventions are made to stop following years getting even worse.