It’s not the case that overweight parents always bring up overweight children, but it’s also not uncommon.

And it’s now been proven that overweight mothers don’t often consider their children to be similarly overweight - even when they are.

According to a new study by the the Brown School at Washington University in St. Louis, overweight mothers underestimate the weight of their obese children.

The researchers studied 230 mothers of pre-school children (aged between three and five) in the US, and 41 per cent of the mothers considered their overweight or obese children “about the right weight.”

Only 20 per cent of overweight mothers correctly identified their children as overweight. And a mere three per cent of mothers overestimated their child’s weight.

In order to reach their conclusions, the researchers asked the mothers to fill out a questionnaire about how they feed their child (including questions such as “Did he/she watch TV at meals?” and “Did you feed him/her yourself if he/she did not eat enough?”) and reveal their perception of the child’s weight.

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Both mother and child then had their height and weight measured.

But the researchers suggest healthy weight mothers may not have underestimated their children's weights in the same way.

“This study included only mothers who were overweight or obese, which may, in part, explain the high rate of underestimation,” lead author Rachel Tabak said.

“This is also concerning in the light of recent research showing children of obese mothers were less likely to recognise their own weight as well as that of their mother and therefore may be related to shifting attitudes toward weight status, where overweight is less recognised because of its prevalence.”