For foetuses, infants and children, the primary health effect of mercury is impaired neurological development. Mercury exposure in the womb, which can result from a pregnant woman's consumption of fish that contain mercury, can adversely affect a baby's growing brain and nervous system. Impacts on thinking, memory, attention, language, and fine motor and visual spatial skills have been seen in children exposed to mercury in the womb.

Impairment of the peripheral vision; disturbances in sensations ("pins and needles" feelings, usually in the hands, feet, and around the mouth); lack of coordination of movements; impairment of speech, hearing, walking; and muscle weakness.

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