I overheard a conversation at school the other day, a mum was telling another mum how she left her young DD (4mo) at home while she picked up her DS (aged 5 or 6) from school.
I believe she lives around the corner and across the road from school, maybe 1 or 2 minutes walk. But pick-up would probably take 10 minutes in total to get the kid, get him ready, leave school premises and get home.
Of course I rationally know that no harm is likely to come to a 4mo left alone for ten minutes. But even if it's very very unlikely that anything bad would happen (to the baby, or the mum, or the older kid), it still gives me the chills to think about it.
Instinctively I want to say something, whether to her or the school. But I don't know if I'm being over cautious.