Foods you should avoid during pregnancy (2º part)

And these are the foods you should avoid for their high risk of being contaminated with heavy metals:

• Fish: some fish contain large amount of methylmercury which affect unborn baby's brain and nervous system. You should avoid completely:
• Shark
• Swordfish
• King Mackarel
• Tilefish
• Seafood: Apart from having some amount of methylmercury, it can also have cadmium, so don't abuse of these kind of food. It's concentrated on shrimps' heads, so don't eat them or add them to soups.
• Maternal exposure to Cadmium increase early delivery, which leads to a lower birth weight. 
• You can eat up to 2 average meals a week of fish and shellfish that are lower in mercury, such as shrimp, salmon, pollock, catfish or canned light tuna (albacore -white- tuna has more mercury than canned light tuna).

Cadmium and Mercury are also transferred in part to the next generation through breast milk after birth. So when you are breastfeeding keep in mind these recommendations about fish and shellfish.

Food you should avoid during pregnancy (1º part) (because of their high risk of causing infections
Food you should avoid during pregnancy (3º part) (because of their high content in vitamin A)