Fish and shellfish are an important part of healthy eating. They contain protein, vitamin D, vitamin B12 and omega-3 fats. Eating fish benefits heart health and it helps children’s brains and eyes to grow and develop. However, the fetus and infants exposed to high levels of mercury may have problems with learning, walking, and talking. It is important to choose fish that are low in mercury. Toronto Public Health’s Guide to Eating Fish for Women, Children and Families provides clear advice about choosing and eating fish.