https://www.theguardian.com/commentisfree/2024/jan/05/children-school-early-years-education-pandemic-covid
Apparently babies born in 2020 and 2021 are more likely than previous cohorts to be behind developmentally. But nurseries reopened in June 2020 and social distancing ended altogether in spring 2021. Absent SEN (which I appreciate might be undiagnosed at that age) isn't this more likely to be a parenting/ poverty issue rather than anything to do with lockdown?