visa for Babies father to join me during the delivery

[zkhan16]

I am a British national but I'm married in Pakistan me and my Husband have no intention of moving to the UK.
I have come to the UK to stay with my parents who are settled here until the birth of the baby, which will take place in the UK.
I will return after the birth, I have a return ticket.
I want my husband to join me for two weeks during the time of delivery, he is not a British national, he is Pakistani and I was wondering what visa I should apply for him?
What kind of evidence etc will I need?
My parents are both pensioners so they cant sponsor him, is my brother a good enough sponsor?