DON"T do it. You can damage your nipples because your body is not ready to breastfeed. Likeveryone else said, it can cause premature & very strong labor. It is colostrum, but not the same composition as real colostrum. As soon as the baby is born, your brain releases a new hormone that starts lactation. Only at that point is it colostrum that is healthy for your baby, full of antibodies. It is just fluid right now. you won't get enough to freeze & it won't be beneficial to your baby because of its lack of composition. It won't up your milk supply either because you're not in lactation mode. It confuses your body by sending the signal to your brain that a baby is needing to be nourished. Search the La Leche League's site at www.llli.org
You can email them questions also.