The new policy was expected to be backed by delegates at the party's conference in Bournemouth.
Children's spokeswoman Annette Brooke told Children Now that the Liberal Democrats wanted to make early years a key election issue.
The party has pledged to scrap the Chancellor's Child Trust Fund to pay for the extra investment.
"This financial resource would be better spent on early years education now," said Brooke. "Evidence supports the fact that investment in early years prevents the need for other support in a child's later life."
The early years centres would provide a broad range of services and would eventually be available in every community in Britain.
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