How long does colostrum stay in your system if you don't breastfeed?

Colostrum, the first form of milk produced after childbirth, is typically present in the body for a few days postpartum. If a mother does not breastfeed, colostrum will gradually diminish as the body adjusts to the absence of nursing. Within about 2 to 4 days, the colostrum transitions to mature milk if breastfeeding begins, but if not, the production will cease as hormones signal the body to stop. Ultimately, the duration it stays in the system can vary, but colostrum itself is not retained for long if breastfeeding does not occur.