Hi A.,
The first line of defense should be your prenatal. If it's absorbing properly, you shouldn't have problems, at least not often. (I can recommend one if youre not happy with yours.) In addition, elderberry extract is a natural immune booster and is completely safe for you and your little one. You can get it in capsule form or in a syrup. The syrup is tasty and can be added to a cup of tea with honey which is delicious.
Are you in chiropractic care? Principled upper cervical chiropractic does wonders for your immune system. That's how I fended off colds during my pregnancies. If your neurological system is functioning properly (with the proper alignment of the spine), then your entire body is at is optimum.
Congratulations! Hope this helps!
M.
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