My answer will suck but it comes from someone who has been married:
You can't control another person or convince them to do something. What you can do is identify what they value and show how saving money increases their opportunities in what they value, but understand that the person could see what you're saying as invalid too. If you're single and reading this, this is why you verify that the person has similar values to you.
Think of it like someone who wants good gas mileage: you show them a car that gets 60MPG, and immediately they say, "Well, but that's not a cool car." So their value isn't the miles per gallon, and you may find the same is true with your spouse. India is paying more interest than the US and Europe in their savings accounts (I believe the benchmark interest rate is 7.5%), so - assuming your spouse values more money - showing him how to use money in savings to passively earn money might be a technique that works. But it may mean nothing to him because it's (1) not his actual value or (2) isn't enough to matter in his mind.
In other words, this is all sales and whatever you do (and this is regardless of gender), don't manipulate, as in the long run that tends to build resentment. If there is a specific problem that you know he sees as a major issue and saving money can help, I'd recommend showing how savings would help with that problem. People generally like solutions to problems; just remember, what you think he sees as a problem may not be what he sees as a problem. This is why I chuckle when I see single people give married people advice; you can't just "convince the person enough" because you are not that person; we have to speak their language and we should be careful to avoid creating resentment.
The part that sucks (or doesn't depending on who you ask) is that if we can't convince others to do it, we should do it ourselves. Either (1) earn money independently yourself when applicable (realizing that you are about to have a child and may be limited), or (2) save the money that you and your spouse have agreed that you're allotted, if this applies to your situation (a few spouses divide income even when one is an earner).