In general, it is recommended that you wait until after your baby turns one year old to introduce any kind of milk other than breast milk or formula. (momtricks.com)
Before age 4 to 6 months, a child's digestive system isn't ready for anything other than breast milk or formula, and herbal remedies might cause diarrhea or other health problems. (babycenter.com)
If you decide to put formula rather than breast milk in your baby's bottles it's best to choose a powder. (articles.chicagotribune.com)