بسم الله الرحمن الرحيم
It is not compulsory on you to perform his aqiqah. However, if you wish you may do so. If he is a boy and you can afford then you should slaughter two goats and if she is a girl then it is sunnah to slaughter one goat on her behalf. If you get two shares in big animal with the intention of aqiqah then it is also enough and it will be equal to two goats.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.