Is that something different from the first breast milk???

[Your breasts produce colostrum beginning during pregnancy and continuing through the early days of breastfeeding. This special milk is yellow to orange in color and thick and sticky. It is low in fat, and high in carbohydrates, protein, and antibodies to help keep your baby healthy. Colostrum is extremely easy to digest, and is therefore the perfect first food for your baby. It is low in volume (measurable in teaspoons rather than ounces), but high in concentrated nutrition for the newborn. Colostrum has a laxative effect on the baby, helping him pass his early stools, which aids in the excretion of excess bilirubin and helps prevent jaundice.

When your baby is breastfed early and often, your breasts will begin producing mature milk around the third or fourth day after birth. Your milk will then increase in volume and will generally begin to appear thinner and whiter (more opaque) in color. In those first few days it is extremely important to breastfeed your newborn at least 8-12 times each 24 hours, and more often is even better. This allows your baby to get all the benefits of the colostrum and also stimulates production of a plentiful supply of mature milk.]
http://www.llli.org/FAQ/colostrum.html