In the days of the Vedas, birth control was not available in its present form, so not much mention of it is made. Many poor people in India are starting to see the benefits of family planning through birth control. It is catching on rapidly. Many states in India are reporting a rapid decrease in births, though it will take a few more generations to see the effects. Two children are very common.
Birth control is free in India to anyone who wants it.
Nurses and social workers visit even the most remote villages to pass out condoms and educate women to their body cycles and personal hygiene. Just as not all Jews are Kosher, and not all Hindus are vegetarian, there are gaps in most religions between principle and practice. Society often alters these principles, but they should still be presented in an educational manner for the more devout Hindus that come into your care.