Bonding with baby #2

How did you mommies bond with your second child? My son is 10 months old & my daughter is 5 days old. I had trouble with bonding with my son the first day or two but I can't seem to bond with my daughter. All I wanna do is spend time with my son. I feel guilty for having another child so soon (they were both unexpected) & I feel bad for not being able to spend enough time with him but I also feel horrible for not bonding with my daughter. I hold her & try to bond but I can't. I don't regret her I just wish I would've had her later on & I felt this way about my son. I'm 18 & already a mother of 2. I know with time I bond with her but it's just really hard right now. Postpartum depression doesn't help either. I can feel it slowly going away but I just wanna feel better & bond with both of my children the same way.