A woman has been fined after police caught her drink driving with a child unrestrained on her lap.

Police pulled Lorrissa-Laine Hamon over when they saw her driving with the child on her lap on March 2, police prosecutor Sergeant Rachel Willemsen said on Tuesday.

Hamon's breath test resulted in a reading of 773mcg of alcohol. The legal limit is 250mcg.

Hamon told police her partner had showed up with the child to where she was, and told her to get home, Ms Willemsen told the Whanganui District Court. She pleaded guilty to driving with excess breath alcohol. Judge David Cameron fined her $700, $130 court costs, and disqualified her from driving for six months.

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According to New Zealand law, children under 7 must be restrained in a car. The penalty is an instant $150 fine.