Is there anyway we can start preparing/eating to ensure we have enough BM after baby is delivered?

Just make sure to eat well, drink well and nurse regularly. Supply = demand. Also, don’t stress (number 1 milk killer). While waiting for your milk to kick in, can always supplement with formula and do mixed feeding while you build up your supply.

Make sure to try confinement recipes, drink lots of hot water, shower in warm water. Always massage your breast prior to feeding to stimulate the flow. And don’t starve yourself, keep having food and soups