Separation anxiety is normal at that age; he should stay calm, try to distract her, know that it is normal and will pass.  It might help if he sees her more often, even if just for a few minutes or an hour.  Babies that age may not remember someone from week to week, it's easier if the contact is frequent even if it is short.  If her crying makes him tense, it won't help.  He needs to work on soothing her, staying calm, maybe show her a toy she likes, and she will warm up to him;.

Hello, I am a mom of 4. Grandma of 2.

I know how your son is feeling. My granddaughter has the same problems with her dad and she is now 6. She now has weekends with her dad and his wife and their son.

  Have him sit and read a book or start playing with toys and see if she starts to join in with him. It will take time but she will become a daddy's girl! Just do things and always keep talking to her. Keep asking if she would like to play with him. Or sit by him and read the book. Let her decide when she is ready for the next step. I know its hard and fusterating at times. But keep at it. DON'T GIVE UP! It will get better.

How frustrating for him. I would say becasue she is still a newborn she is probably still wanting mother by her side 24/7. Specially if the mother is nursing, that would build  a strong bond between baby and mother. The more time he spends with baby and the more involved he gets (i.e. feeding, bathing,rocking her to sleep) baby will woon to him too.

It is hard for the daddy's too. My husband got frustrated with our son at times but, the more time they had together and the more involved my hubby got our son warmed up to him in no time. hang in there :)

This is very common. When my daughter was 7 months old , she would cry whenever she saw her grandmother. Tell you son NOT TO GIVE UP !!

He just needs to keep spending time with her and she will become more familair with him. Today my daughter is 15 months and does not want leave her grandmother's house. NOW IT IS HARD TO SEPARATE HER FROM HER GRANDMOTHER !!