Your body produces colostrum during pregnancy, baby’s first form of breastmilk. When your baby and the placenta are delivered, the change in hormones will trigger your milk production. Supply is based off of supply and demand. (I’m currently nursing my fifth baby, and I was also a milk donor.)
As above, your body produces colostrum while pregnant and this is all baby needs for the first few days until it gradually changes to mature milk. This is triggered by the removal of your placenta. Then it works by supply and demand, the more you put baby to breast the more milk you will produce. Nothing you eat or drink has been proven to boost supply, but it’s important to stay hydrated and consume extra calories as it takes a lot of energy from you
Protein is a big component! And staying hydrated. Keep in mind the first few days you won't have any milk and will only have colostrum which is excellent for baby. You can also speak to your midwife or OBGYN about collecting colostrum after 36 weeks, you may be a candidate for it. I'd also recommend seeing a lactation consultant after birth, even if you think is okay, it could be better ☺️