Hi,
Have a look at this and/or send it to the father. https://www.netherlandsworldwide.nl/living-working/registering-a-birth-abroad/indonesia
As I understand it doesn't mean your child will be Dutch but may help one day when he/she reaches 18
If the baby isn’t born yet he can go to the embassy and “acknowledge” the child, this must be done before birth and that way he/she will get dual citizenship.