An understanding of the relevance of the messages requires following the timeline of events and the evidence being presented in court, in most instances.
The above quoted messages at 5.10am weren't included for the language used by the nurses, IMO. They were to show what LL knew about baby N two hours before she arrived for her day shift, whereupon she went straight into the room where he was being looked after. His collapse 5 minutes later is the second allegation of the attempted murder of baby N.
"A colleague said Lucy Letby came into the room to say hello, but when the nurse's back was turned, Letby told her Child N had desaturated before assiting with the breathing."
"He [the doctor] was “surprised by his anatomy more than anything else … I could not visualise parts of the back of his throat because of swelling”.
The doctor saw "fresh blood" in Child N's throat, which the prosecution say was the same seen in Childs C, E and G.
The doctor was unable to get the breathing tube down the throat of Child N as he was unable to visualise the child's tracheal inlet.
He attempted to intubate Child N on three occasions."
Recap: Prosecution opens trial of Lucy Letby accused of Countess of Chester Hospital baby murders
The above messages were introduced into evidence to show that LL did not bring the bleeding to the attention of anyone else. She was replying to the doctor's message on Facebook half an hour after more bleeding.
[in police interview] "She could not explain the entry in her notes timed at 10am on June 15 in which she recorded aspirating more fresh blood which she had not apparently brought to the attention of anyone else."
Recap: Prosecution opens trial of Lucy Letby accused of Countess of Chester Hospital baby murders