This blog post is guidance for getting an Indian passport for your infant. If you search on Google, you will find a number of resources saying a lot of document you need to carry but trust me you don’t need anything other than a passport of you and birth certificate of him/her.
Along with it you should carry her passport size photograph if she is less than two years old.
If there is a scenario that you have not changed your name after marriage, you can apply parallel with your baby for name in change on your passport.
Once passport procedure is done, you have to go to police station for verification and don’t forget to carry your baby along even when number of resources mentioning about not carrying baby. Because that was a double hectic for me.
If you have any questions please let me know. I will be happy to help.