My 5 week old lb seems to be making good use of his lungs, as when he needs our attention, he no longer cries, he seems to scream like the world is coming to an end!! Its the kind of screaming where you are waiting for him to take a breath! It stops as soon as we tend to his needs and he becomes perfectly content again. Is it normal for him to behave and be up and down like this? It makes me worry that maybe he is unwell as its only just started happening.