It is the closest substitute to breast milk. If formula is your last resort, be sure to add a little flax seed oil to it. Once they wean from bottle or breast, encourage them to drink filtered water often, especially when the weather is hot. Juice is often difficult to digest and once processed and bottled, it has lost most of its nutrients. It is not necessary to a healthy diet.
Fresh fruit is.
Limit juice to a few ounces each day and consider buying fresh juice if you want to serve it. Add flax seed to their diet by adding nutty flavored flax seeds to oatmeal, salads, vegetable dishes, or the oil to smoothies, formula, etc. As soon as they are old enough, give them small amounts of nuts and seeds for snacks. Avoid granola that is loaded with sugar. The most important thing you can do for your kids is to not give them processed sugar.