@cmlala17,
I think its should be moral and not cultural.
The killing of one human is killing of all human-being and humanity.
What this little angle took from you? Why you conceived it? Why you are going to kill it? Who allow you? do you have any sense? If you don't like your subling, please handover this little angle to any couple trusty for childern and they not able to conceive.
Hope this helps.
Thanks