Children arrived in my DiL's reception class in September, many wearing nappies and most eating with their fingers etc. She thought it was because Covid had meant that she couldn't liase with the parents as she would normally.
I can understand children's social development being affected but surely, if they've spent more time with their parents during lockdown, they should have learned most of the other skills they needed to start school. It's the parents' job to teach them to use a knife and fork and to potty train them. What were they doing all those months? Presumably staring at screens while their parents stared at their phones, although I accept that some parents were working from home at least some of the day.