"Nature never disappoints."
I once read this sentence in a parenting book and I have to say: it's simply true. With my children, too, it was sometimes a fuss until they were dressed, they whinged that they didn't want to go out and it took forever until we were outside. But when we were outside, in the snow, by the stream, in the meadow, somewhere in nature, it was always great, the children always had fun discovering something, something that interested them.
So here's my suggestion for you: No matter how early or late it is in the day. No matter whether it's cold or warm. Going out with children is always possible. And it's always good and incredibly important for children to get some exercise in nature, to explore and investigate things. And by the way: it has been proven that fresh air also strengthens children's immune systems.
To conclude with Hape Kerkeling: "The boy needs to get some fresh air." And so does the girl :-).
Further interesting tips
Stork bite
Not a disease, but an interesting phenomenon that occurs in babies and sometimes causes irritation in young parents: the so-called stork bite.
Ringworm
There are always phases in which rubella infections increase. In the vast majority of cases, this is not a major issue for the children affected - and yet the disease can be problematic.
Fear of (visiting) the doctor
There are always children who are terrified of their paediatrician - or of a visit to the surgery. What can you do about it? A lot.