Hi there,
I'm 34 weeks pregnant now and I know it's all a bit of a worry at first, but worrying about everything in it's self is probably more harmful to the babies development than relaxing and even eating things you're not supposed to!
Worrying about events that might never happen is a very negative waste of time and vital energy when she could be focusing on the positive. It is pointless to worry; if you can do something about the situation you're worrying about then do it, but if not it is totally pointless and only serves the purpose of causing unnecessary stress which is what you don't want. Millions of women having given birth to perfectly health babies before the times of don't eat this and that and we're all here as proof.
I think it is an important time for her to focus on sorting out her head and letting go of events that she cannot control otherwise once you have a baby it will only make the problem worse worrying about what could go wrong with your child and the dangers it faces.
I would recommend that she goes for counselling or acupuncture can really help to calm the mind and focus it on the positive. She needs to cut out stress as we all know how dangerous high levels of stress are and the nasty diseases it can cause so what harm might this do to her baby?
As Cathy said there are only a few things she needs to avoid but also she needs to remember that her baby is very well protected in the womb form all sorts of nasty things, you need to try not to worry so much either as if she does not eat enough her body will be the one the damage is done to not the babies, a baby will take all that it needs for it's development.
Pregnancy goes so quickly and what will be will be, it would be a shame for her to ruin the experience by worrying, it is a time to relax and enjoy.
I have had a completely uncomplicated healthy first pregnancy and my tops tips for a healthy pregnancy are:
Eat a good wholesome balanced diet with plenty of fresh fruit and vegetables.
Avoid processed foods with high fat and sugar.
Avoid alcohol.
Exercise lightly whenever you can e.g. walking, swimming, yoga.
Drink plenty of water.
Relax and sleep as much as you feel you need to.
Avoid stressful situations if possible.
Get help - ask for help if you need it, this may mean going for complementary therapies to help you to relax.
Hope this helps!
I wish you both a happy and healthy pregnancy[

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Bonio