Hi!
I think everyone has great advice with keeping it natural. The only thing that I would add is to limit caffeine, which I noticed caused a rash on my new babe. Also, to limit gasiness, take LOTS of pro-biotics, "friendly flora"--by eating cultured yogurt, sour cream, kefir, and other cultured dairy. If you can't do dairy, try taking a good supplement, like New Chapter's All-Flora. This is important for populating your baby's GI tract with friendly bacteria. Your baby will get it through your milk, and you can also break open a capsule in water and rub it on your baby's tongue and gums.
You need to make sure you're getting enough digestive enzymes, which you can get by eating things like raw pickles, or you can take in supplement form. Good brands are from ReNew Life, Rainbow Light...just make sure that they are plant-based and include Lipase.
Good luck!