What are common hereditary dental conditions that affect baby teeth?

They are numerous. Hypomineralization hypoplasia or aplasia of the enamel amelogenesis imperfecta dentinogenesi imperfecta rickets jaundice associated with premature birth klinefelter's syndrome (taurodontism) congenital syphilis hereditary porphyria.
Very UNCOMMON. Amelogenisis imperfecta and dentinogenesis imperfecta are two of the more common hereditary conditions that affect the development of teeth but these are extremely uncommon, occurring 1 in 14, 000 and 1 in 7, 000 respectively.