Final answer:
The most effective prevention for the conditions described in the question is proper prenatal care and screening for infections during pregnancy.
Step-by-step explanation:
The most effective prevention for the conditions described in the question is proper prenatal care and screening for infections during pregnancy. The presence of hydrocephalus, jaundice, hepatosplenomegaly, retinal exudates, and scarring indicates a possible infection during pregnancy, such as congenital syphilis. Congenital syphilis can be prevented through routine prenatal testing and treatment with antibiotics.