If the couple do not want to get marry and still want to have kids.
Can they still put their names as father and mother on the child birth certificate?
What disadvantages does doing this have as compare with normal couples who marry and have kids?
Can, both parents if without marriage cert, needs to go down to ICA together to take an oath to declare that they are the biological parents of the child during the registration.
The advantage is that people will not know that your child is born out of wedlock? in future if both of u get married, no need to go through the hassle of including the father's particular into the birth cert, which is subject to approval and DNA test required.
the disadvantage would be that if things turn ugly, the father can claim the child. and if you are a guy, most probably the mother could claim monthly maintenance of the child from you.
Take your time and think through before registering the birth.