Vitamin A, but only in small amounts. Too much Vitamin A is toxic to the body and can be lethal. Some experts warn against eating liver during pregnancy as it is very high in this nutrient. Fruits and vegetables which are yellow or orange are high in Vitamin A, so include some carrots, pumpkin and squash in your diet. Be careful though, too much can stain your skin and you’ll end up looking like you’ve had a spray tan gone wrong.