The former star of The Hills gave birth to son Camden Jack on August 8, and told People that she and fiancé Jay Cutler had settled into parenthood quickly.
Cavallari admitted the couple were "shocked but really excited" by the pregnancy and are hoping to expand their family in the future.
"We're talking about having another baby soon. We want kids close in age. Jay wants four so we'd love to have two closer in age, take a little break then have two more," she said.
The 25-year-old added: "I can see us having another baby in a year. We'd love to have three boys and a girl. But we'll be happy with anything."
Cavallari has previously spoken of her love for Camden, saying that being a mother is "the most incredible feeling".
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