What's a good age gap between littles?

I already want another even through all the bullshit with my husband I can't deny he's a great dad. I was thinking like 4-5 months but then in reality I was thinking a year. I already have baby fever and I'm almost healed up from the previous one.. and I was joking around with him about another one and he said lets go. I feel guilty for wanting another baby so soon 😭 give me all the babies.. but seriously what's a good age gap. Advice needed