1. if you do not wish to get into legal battle, bring her back first, then talk to her by convincing her that ,it is you, she and the child are the family and it is time to think about your family.
2. if you are successful in getting your wife's confidence she herself can stop her parents from ruining her marriage.
Now the legal option for you is to file a" Restitution of conjugal rite "(RCR)petition in a district/family court asking to intervene to pass an order to her wife to join your marriage. RCR is a failure in most cases as the very purpose of the RCR can be mistaken by the opposite party as a legal battle , where as it is the petition asking the spouse to join your conjugal/married life .
The order under this petition cannot be executed as the court order cannot be forcefully imposed on the other party. once the order is passed, one year time is given to the party against whom the order is passed to join his/her spouse. in case this order is not observed for an year the other party can file the divorce. Hence for you it is too early to file a petition like this.
You being the husband , limited options are available, so first go to your nearest police station ,, talk to the inspector about this, then go and bring your wife. if the parents of your wife make a complaint under 498A and forward to your police station the police will inform you as your NC is pending.this will help you to obtain bail /other precautions in advance. Remember being a husband and father , it is your ultimate right and responsibility to have your family with you so get them. Do not be afraid of the false complaint .
Try and convince your wife and bring her back, that is the best option, in case she is not coming back, send her a legal notice asking her to join you and proceed with RCR if you do not wish divorce. You also have the option of divorce if the wife desert you without any reason. you can file divorce on grounds of cruelty and desertion or on any one ground. This option is to be considered only when there is no hope of marriage.