Within the legal tradition of Muslims Qurban means different things. If you mean to do it as an act of devotion, to come closer to Allah through the service of others it is allowed. Also giving Qurban to seek a good future or health of unborn child or your pregnant wife is allowed.
You can make it as a vow to Allah as well. It is praiseworthy. Although this is not mandatory.
Shaykh Yahya Ibrahim answers and explains..
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