WA drink-driver had baby on her lap

A woman has allegedly been caught drink-driving with a five-month-old baby on her lap in Western Australia's Wheatbelt region.

Moora Police tweeted on Wednesday that the local woman was a suspended P-plate driver with a blood-alcohol level in excess of 0.08.

It is the latest in a series of similar alleged incidents, including a 29-year-old mother who crashed her car on the Kwinana Freeway just before 1am on Monday with her four-month-old baby inside.

Police say she recorded a blood-alcohol reading almost three times over the limit.

Another woman with children in her car allegedly returned a reading of 0.3 in Cottesloe on Christmas Eve.

Police Minister Liza Harvey told reporters on Wednesday that it was very concerning to see people with children in their car driving under the influence of alcohol.

"You don't want to be the headline on the front of the paper where you're the drunk mother that killed your kids in a car crash, or worse still, ploughed into someone else and killed their children," she said.