If it’s any consolation DS (now 4 and a few months) spent the majority of his first 14 months travelling Europe in a campervan. He only had me and his dad for company. We enjoy peace and quiet so spent the majority of our trip wild camping in isolated mountainous spots, walking, swimming, climbing and cycling. We only really saw people when we shopped. On return home I couldn’t stand toddler groups, just not my thing, so he’d mainly get plonked in my bike trailer or sling and we’d go out for long walks or rides with picnics. Both our families live abroad, there isn’t anyone local. We both socialised with our friends minus DS (we took it in turns). So pretty much the only contact he had was with his dad and I until he was almost 3.
He started play school when he was almost 3 - this was the first extensive/ regular contact he’d had with anyone other than his dad and I. Obviously he’d bump in to and interact and play with others in parks and so on, but no different to now. He only did 2.5 days a week in term time. He wasn’t there that long before it all shut for the first lockdown. He then returned in September - he LOVES it, he gets excited about going, chatters about the staff and other children and what he’s done.
DS is a very confident, sociable, very well adjusted, super chilled and a total chatterbox. He doesn’t stop chatting or questioning things. He’s only really formed friendships over the past 6 months or so (but I thought that was pretty normal for his age?). There’s never been anything that has struck me as odd or made me feel he was behind or missing out.
Obviously he’s older than yours... but we did the isolation-y type thing by accident really. My DS really hasn’t suffered and there’s nothing that has ever worried me or his dad about his behaviour or development (his dad is a child protection social worker so very switched on to ‘normal.’)
Obviously every child is different. Likewise every parent is different. If he’d have been school age I would have been really worried!! I think when they’re so little the most important thing is being loved and given attention/ interacted with and having a super strong attachment with parent/s. Likewise parent/s attitude, mood and health is super important. I totally get that this utter shite will have had a huge impact on my latter point though.... I think that is far more worrying for small children (any age child!) than a lack of toddler groups, classes and socialisation.