A baby spent five days in hospital with a common virus that his parents believe his sister first contracted at school.
Newborn William Sangwin developed bronchitis after catching respiratory syncytial virus (RSV), a common virus that usually causes only mild, flu-like symptoms.
Hull Live reports his mother Kirsty Mills, 37, said the virus which led to her son's stay in Hull Royal Infirmary was first caught by his older sister Charlotte, four.
Kirsty said: "It was about three weeks ago, before half term. William was two weeks or so old. He went into hospital twice.
"At first he got a little better and was discharged within a day. But then a week after, he got really bad with it, tested positive for the RSV bug, and then developed bronchitis."
While common, RSV can be serious, particularly for infants.
In William's case, doctors have warned that he has developed a compromised immune system.
Although it is not certain where four-year-old Charlotte caught the illness, the situation has prompted the family to take her out of Leven Church of England Primary School for a week while her brother is "vulnerable".
"It was all quite a worry and stressful for us," said Kirsty. "He's not strong enough to get another bug yet."
Charlotte's absence is being marked as "unauthorised" by the school, a decision her mum says is disappointing.
Kirsty said the school's headteacher had since clarified that her absence could only be authorised by a doctor's letter indicating her sister's presence would be detrimental to the baby.
Alternatively, due to being aged under five, Charlotte could be de-registered from the school and re-registered in January.
"There must be other families out there who are experiencing the same thing," said Kirsty.
Due to Charlotte being under five, there is no possibility of a fine for the unauthorised absence.
"It's gone through us all like wildfire," Kirsty said of the infection which had caused such a scare for the family.
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