Advice on a job offer & daily life. Its urgent!

As all inquiries about cost of living, your question is impossible to answer correctly.
How much money you need (and thus how much you save) is entirely up to your spending choices and there is a very wide range of busgets and opinions - read this thread to get an idea: https://www.expat.com/forum/viewtopic.php?id=547670

I personally think (based on my experience and lfestyle), if you come alone the salary will afford you a good lifestyle and savings. Coming with your husband is still possible, but can be tight. With kid it's impossible.

Thanks for your advice.....but one thing is that my husband will also be working so we would be two earning members along with our kid.....so it wud bit easy right?

As I said, it's impossible to answer your question without knowing the details of your lifestyle, expectations and spending habits. Did you read the thread I linked to?
Of course it is easier with two incomes than with one, even though you'd have to pay for child care.

Yeah had gone through it earlier. Our lifestyle as i mentioned in the post initially will be very simple and basic for the start to make good savings, not much lavish outings and cooking at home. Once we are settled with good savings we can start to spend a bit i guess. Whats your thought on this?

You need to do some research (e.g. in existing threads on this forum) and build your own opinion.
People who are talking about "cooking at home" to save money clearly haven't done so: In Singapore, the cheaper eating out options (hawker centres) cost less than what you'd spend in the supermarket!
In any case, the major cost factors are rent, education (and car, if you want one):
Rent is S$800-1500/month for a sublet room, S$2500-3000/month for a lower class flat, up to S$10000/month for luxury.
Child care is around S$1000-1500/month, local schooling S$500/month (IF you get a place, which isn't easy), international schools S$1500-3000/month.
A car will cost you at least S$1000/month (plus the initial cost of buying one - used cars start at S$20000).
But you could have found that easily by brwosing this forum a bit on your own!

yup i have done the initial research and hence clearly mentioned no personal vehicle for us. cooking is at home because mainly i prefer home cooked food for us especially our kid...i mentioned it because you wanted to know what lifestyle are we aiming at.