Kourtney Kardashian’s relationship in turmoil

Despite the birth of their daughter last month, Kourtney Kardashian's relationship with Scott Disick is in serious trouble.

According to Radar, the Kourtney has become increasingly frustrated and angry with Disick who has reportedly returned to partying and drinking heavily.

A source said he Disick is "on a downward spiral" and "more of a mess than I've ever seen him."

Kourtney also does not trust him to care for her newborn daughter, Penelope.

"Scott is never alone with Penelope because he is so irresponsible," said the insider.

"Kourtney doesn't even like for him to hold [the baby] because she's afraid he'll drop her."

The National Enquirer reported that a recent incident involving son, Mason, 2, did not help the situation.

Witnesses claim Disick left Mason in a parked car in California's 107 degree heat on August 10 while he browsed through magazines at a store.

Kourtney, 33, was said to be angry and upset at his reckless behaviour. 

“All she could think about is that Mason could have died. She read Scott the riot act, and so did her sisters Kim and Khloe. They don’t want Scott taking the kids anywhere now unless someone is with him. Kourtney was shaking and in tears, and she called Scott everything in the book. They can’t be­lieve Scott could be so mindless and do something potentially so disastrous.”