Just came back from paternity leave and it's hitting different

I'm only 3 days back at work after 6 weeks home with the baby and I feel like I'm failing at both jobs now. I'm distracted in meetings thinking about whether my wife is managing okay with our 4-month-old. But also I'm not giving my work the attention it needs. My boss asked me to lead a project and I almost laughed. How do people do this? Did anyone else struggle with the transition back or is it just me being soft?