Blue tit chicks (1 Viewer)

[Cambridgeblue]

Hi all, I am new to this forum.
10 days ago, our blue tit nest of 10 eggs hatched. But over the next two days, 2 died. Both parents fed the chicks well. On Tues (10/5), 6 chicks died overnight. By the 13/5, all the chicks had died. Anyone had such tragedy with the blue tits? Could it be tit pox?

 

[rob29]

We have just had the same. 9 eggs, 8 hatched and were being fed well. Only one appeared to be still alive yesterday morning but by the evening was dead. The mother is still coming into the nest, sitting on the one egg which can't hatch. Any ideas on the cause ? Not lack of caterpillars.
In previous years we had 10, 8 and 7 chicks fledge and no attempt at a second brood. Is this likely to occur in these circumstances ?