My daughter is 4 weeks old. She's breastfed and suplemented with S26 Gold Hypoallergenic. The color, smell and quantity of her stool is normal but there is one thing I'm worried about, her poop is some what like oily. Whenever I clean her with water and soap it sticks to her skin and even to my hands, it's hard to remove just by using water, thats why everytime I clean her I have to use wipes first before cleaning her with water and soap. Is this normal? Wondering which one is the problem, is it my breast milk or the formula milk I used, if it's the formula then what would be the best formula to use? What would be the cause of the oily poop?