I think all families and situations are different. The way I think about it is to attribute a value to time for free play, and free time spent in the outdoors - and then look at whether the activity you are doing is meaning that these are getting squeezed out and then also if activity itself you consider more important (e.g. swimming I think is particularly important). I think concern around too many activities is not really about the number of activities but around how much time is left for free time/play - and for each family this will be different depending on other commitments. I personally don't like the term 'down' time which is often used because I think it kind of doesn't embrace the value of time not spent doing activities - and I think that time is very important (particularly time spent outdoors not doing a sporting activity).

DS does none, DD does an art class and swimming (which I am not totally convinced that I count in the same way as I see learning to swim as a necessity at the moment).

I do think the child's enthusiasm for the activity comes into play as well when deciding on how many/what