Yep, that was what happened to me and my sister in the 1960s in Yorkshire. Good long naps outside everyday, and we were both born in November. My sister was born in 1962, and we all know what sort of a winter that was!!
Don't think we benefitted from those lovely, high-tech materials to keep us warm either. We had wool blankets, knitted cardis and a silver cross pram.
Not sure whether we were healthier or not: I suffered from dreadful tonsillitis and chilblains all through my childhood!! But I suppose we do both like to be outdoors even in the winter.
My sister now lives in Sweden and we have visited her in December, Jan, Feb, March, April ? winter does last a long time! I think if you live there, you have to be used to be outside when it's cold. Three and four year old children gather at their nurseries when it is still dark in the morning and play in a sub-zero, floodlit playground until it's time to go inside. It's just how life is lived in the winter.