Depression hit different after baby number two

Had PPD after my first kid but didn't know what it was, just thought I was tired and unmotivated. This time around I know what to look for and I'm not doing well. Everything feels heavy. My wife is doing great but I'm struggling to bond with the baby and I feel like such a failure for not being happy right now. Started an antidepressant two weeks ago. Anyone else been through this? Does it get better?