This is an expanded access study to assess the safety profile and changes in serum direct bilirubin levels in infants with PN associated cholestasis. Eligible patients will receive therapy with Omegaven on an expanded access basis by method of continuous infusion. Omegaven will be infused intravenously through either a central or peripheral catheter in conjunction with parenteral nutrition. The same standards of care provided to all patients receiving parenteral nutrition solution will be followed.