There has recently been an increase in Pertussis (Whooping Cough) cases and as your baby will not receive their vaccine until they are 8 weeks old, that is the time they are at most risk. If your baby does get Pertussis, they will become very unwell and will almost certainly have to be admitted to hospital for care.
Pregnant mums can help stop this by getting a Whooping Cough vaccination between 16 and 32 weeks, (though you can have one right up to birth). This provides your baby with protection, because the benefit passes from you to the baby in the womb. This protection fades after the baby is born, which is why it is important that they get their own vaccination at 8 weeks. Click here to see the NHS information on this – https://www.nhs.uk/conditions/pregnancy-and-baby/whooping-cough-vaccination-pregnant/