How can I help my husband?

He’s been very depressed lately. We had a baby this past July, but have been basically stuck at home since March due to Covid. We do go out, but it’s more so me. He works still but his job is 100% remote... he used to be so into fitness, staying active, going out with friends. But now he just eats junk, drinks more and is up really late. I want to help him but idk how to! I feel so bad 💔