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There's a slighly higher chance of bugs which cause food poisining in blue cheese, pate etc. So people with weak immune systems are advised to avoid, pregnant women generally don't have a weak immune system but even a relatively mild poisoning with Listeria that would be shaken off easier can cause a miscarriage. That's why you're advised to avoid when pregnant.
If your baby is normally healthy the very slight higher chance of food poisoning doesn't really matter as he'll be able to deal with it fine so no need to worry.