heheha ,
Hi! my girl also 34週出世 & her 體重只有4磅5 last time.
When she is出世 around一個月, her 體重有7磅, your bb is not bad at all. Don't worry!
As what u said "但她常常飲奶後都打c 益, 又成日睡和伸懶腰, 唔係食就睡至到幾多個月呢?" This is quite common for new born bb, even not a pre-mature bb will have the same... When they are bigger, they will sleep less than now.
And for "有時睡到一半時無端端哭樣子好辛苦地含住啖奶連痰想吐出來, 又點算呢?" , as I don't really understand what is the situtation....& seems u are quite worry about this.....how about u consulant a Dr. or nurse, even though might not be really necessary.... but if this could make u not so worry & understand why it happen.....it's worth!
Of course, take care a pre-mature bb is more difficult,tired than the ordinary bb. But bb grow up & keep on improving much more faster than what u imagine.....don't worry too much la!
Wish u & your bb will be healthy & happy all the time!