Soft cheeses (e.g. Brie, Camembert, feta) and liver pates	These foods may be contaminated with the bacteria, Listeria  which may lead to miscarriage and stillbirth. As pregnant women are more vulnerable to food poisoning, these foods should be avoided. Processed and hard cheeses are however, safe to consume.
Raw and undercooked poultry, eggs and seafood e.g. raw oyster, cockles,sushi, sashimi and raw or half boiled eggs	These foods should be cooked thoroughly before eating as they may be contaminated with the bacteria, Salmonella, which can cause food poisoning. Note that for eggs, they should be cooked till both the yolk and the white are solid
Large deep-sea fishes e.g. shark, swordfish, king mackerel and tilefish	These fishes may contain methylmecury, a heavy metal that is toxic to the developing fetus’ neurological system.
Unwashed salads	There may be bacterial contamination from soil, which can cause food poisoning.
Alcohol	Alcohol should be avoided during pregnancy, as it can be passed via the placenta to the developing fetus, and may directly affect the development of the fetus. Possible adverse effects include low birth weight, mental retardation, facial deformities and heart problems.  Small amounts of alcohol in cooking should be safe, but care should be taken to ensure that the food is thoroughly boiled after adding the alcohol, so that the alcohol will evaporate off
Caffeine	Limit caffeine-containing beverages (e.g. coffee, tea) to a maximum of 2 cups a day, as excessive intake can increase the risk of cleft palate as well as having a baby of low birth weight
Herbal products	These are not recommended during pregnancy, as there is a lack of scientific research to make any recommendations for their use during pregnancy.

Here's the guide on how to get a balance diet during pregnancy. http://www.healthxchange.com.sg/healthyliving/womenhealth/Pages/balance-diet-pregnancy.aspx

Food that is good for baby's skin can be found in this article: