Kristin Cavallari has revealed her son Jax struggles with colic.

The 27-year-old television personality opened up about her six-month-old baby to the Daily Mail last week. Cavallari and husband Jay Cutler are also parents to two-year-old son Camden, and their experience with Jax has proved to be a bit more demanding.

"They always say the second one is harder and that's very true," she admitted. "I was very colicky as a baby, so I guess Jax is a lot like me. Jax is a little bit more difficult. But he is still the sweetest and the best. So, it's fine."

Baby colic is defined as episodes of crying in excess of three hours a day more than three days a week, for three weeks or more in an otherwise healthy child. There is generally no cause behind the condition, which is treated with calming measures from the parents.

Cavallari and Cutler have been together since 2010, and married in June 2013. The couple have made headlines in the past for refusing to vaccinate her children.

Cavallari came to fame on MTV series Laguna Beach, and later replaced Lauren Conrad on "The Hills." The television personality has since appeared in films such as "Spring Breakdown" and "Wild Cherry," and also designs clothes, shoes and jewelry.