A new policy paper on the issue, Are We Being Served?, will be presented to the party's annual conference on Wednesday.
It argues that children and young people need specific consumer protection, because they face "too many commercial pressures".
The party wants to stop "the heavy promotion of undesirable products such as suggestive lingerie for six-year-olds and unhealthy foods and drinks".
Advertising increasingly targets younger children, and families are often unaware of marketing tactics, the paper warns.
It claims "young people are encouraged to buy more than they need and more than their families can afford".
The Liberal Democrats are also concerned about the way products are promoted to children and young people online.
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