1) In two patient with excessive hyperlipidemia diet in the post-partum days resulted in a rapid reduction of the high neutral fats in the serum which were 6,150 mg/dl and 6,290 mg/dl respectively. In one patient the hyperlipidemia was reduced by diet during the pregnancy. The course of the pregnancies and the puerperium were uneventful. Complications during delivery were not related to the hyperlipidemia. Coagulation defects were not tested.--2) Excessively high serum lipid values of the mother only had a minor influence on the serum lipid values of the mother only had a minor influence on the serum lipid values of the infants. The infants had slightly elevated values compared to controls. One infant was tested at age 7 months and showed definitely elevated lipids with higher values than neonatally. A familial hyperlipidemia was confirmed in this case.--3) The milk fat values (Total Cholesterol and Neutral fats) were not influenced by the hyperlipidemia. Breast feeding was therefore safe.--4) Both infants of the mothers with hyperlipidemia had neonatal hyperbilirubinaemia with values of maximal 16.2 mg% and 16.7 mg% which required phototherapy.