My daughter is now just over two weeks old. She's doing fine, gaining weight fairly rapidly, with only what seems like a minor cold or something giving her (and us) any grief.
We recently returned from a trip to my cousin's wedding on the Sunshine Coast on the mainland and sunshine was definately not in short supply. It was very warm and that can cause a lot of problems for little kids. The baby managed quite well and was kept in the shade for most of the trip. My three year old, however, had the difficult task of being a three year old in the sweltering heat. Just trying to keep him cool all day was a full time job and in the end ultimately impossible. He didn't last the entire wedding and fatigue finally caught up with him, resulting in a major meltdown.
There is nothing more futile than trying to deal with an inconsolable child. There is, literally, nothing you can do. Everything is wrong. The only positive thing was that, in the morning, everything was back to normal again. If you can call the activities of a three year old normal.
I learned a valueable lesson from the adventure, however. Travelling with kids is not for the faint of heart.