I know toxoplasmosis is dangerous for fetus/pregnancy. but what happens to an infant if they are infected with toxoplasmosis?

Can be severe: Most adults that develop toxoplasmosis get a flu like syndrome but rarely develop severe toxoplasmosis. Infants, children and people with compromised immune system may develop severe toxoplasmosis which can cause encephalitis, a severe infection in the brain.

May or may not sick: In congenitally acquired infant - may get symptoms as fever enlarged glands&liver,jaundice and bleeding problem muscle weakness .Otherwise healthy kid no symptoms . In kid with weak immune system may have fever,seizures, headache vision problem, liver and spleen e enlargement and speech problem .If treatment started early in time ,the disease is contriolled .

See link: Check out this link. It is the CDC Info od Toxoplasmosis and pregnancy: http://www.cdc.gov/parasites/toxoplasmosis/gen_info/pregnant.html