Could this be because parents in Northern European countries such as Sweden are able to be more relaxed and have more balance because of their generous maternity policies? American mothers are more likely to work than their European counterparts – perhaps as a result of limited State support.
Across almost all countries, the increased analysis of parenting likely results because having children has become such a calculated thing (the extreme of which can be seen in the way China is bringing up its much talked about "Litte Emperors"). In general people have fewer children later in life and plan carefully for those that they do have – so naturally they are more likely to also carefully analyse what they do once they have them. This has its pros and cons. Of course one should consider the most important job of being a mother or father as a professional role. There are many helpful courses and books which really help out parents. But by the same token, children need to learn to be independent, help out, and walk on their own two feet. Overly molly-coddled children might find it difficult to learn these skills – and there are less opportunities in one or two children families in general to learn to do things for yourself or help out a younger sibling I imagine. It is worth thinking about the extreme of China and the unwelcome effects too much undivided attention can have!
Whatever causes kids to say that they like being kids is positive (unless it’s that the lives of the adults around them look increasingly incredibly complicated!), but let’s hope we get the balance right.