TDS is directly related to the purity of water and the quality of water purification systems and affects everything that consumes, lives in, or uses water, whether organic or inorganic, whether for better or for worse.
Both you and your babies may be happier. Chocolate is a stress reliever. It boosts and improves a pregnant woman's mood. Researchers point out that pregnant women under a lot of stress can give birth to livelier and happier babies if they often eat chocolate. Chocolate contains essential antioxidants. Chocolates have flavonoids which contain potent antioxidants that improve immunity.
Some babies do have reactions to certain foods but the fact is breastmilk is affected only by what passes into your bloodstream, not what is in your stomach. There is no cross over between the two. If you do find that your baby is reactive after eating chocolate, it may be the caffeine.