Query regarding Infant's Visa‏

Dear Sir / Madam,
Nin Hoa !
I hope this email finds you in good health. Me and my wife are Pakistani citizens and we are currently studying at China Agricultural University in Beijing. And both of us used to live off-the-campus in a rented apartment. On July 2015, both of us came to Pakistan (on leave) and my wife gave birth to a cute baby-girl. We are now planning to go back to Beijing in December 2015. We have applied for our baby passport and hopefully will get within few days. Now my question is that:
1. Do we need to apply for infant's entry permit?
2. What are the requirements?
It is therefore, requested please guide me in this regard. Looking forward to hear from you. Xie Xie....