I am struggling to find out more on the possibility of obtaining dual citizenship for my baby boy next year and hopefully some of you out there will be able to help

I am a Singaporean and my husband holds a Dutch passport and we are expecting our baby boy netx year. From what I gathered so far is my boy will automactically be a Singapore citizen as I am Singaporean and he is born here.
Question #1: Is it possible for us to register him in Dutch Emabassy and get him a Dutch passport so at the same time he will hold both Dutch and Singaporean citizen until he is of a certain age?
Question #2: At what age does he have to renounce either one of the citizenships?
Question #3: Will he still be subjected to National Service even if he decided to give up Singapore citizenship?
Anyone out there with the similar situation? Can you share with me what decision you made and any advice for me?
Thanks in advanced!
LCE