text_1: 5-week-old born at 32 weeks gestation, grunting at 4 weeks, asked pediatrician then, he said okay, not to worry.  Now more tachypnea and tachycardia, less grunting.  What is the cause?
text_2: 5-week-old born at 32 weeks.  What is the cause of the tachycardia and tachypnea?