Ed Miliband maintained there were "hundreds" of Sure Start centres which had been forced to close due to Government cuts, despite the Department of Education's claim only 45 had closed.
The Labour leader was adamant "our figures are correct" and that there were now 576 fewer Sure Start centres since the last General Election.
He went on to continue his party's pledge to support primary school children as well as under-fives with adequate childcare if Labour win the next election.
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Labour have lost the Copeland by-election, a seat they had held since 1983, as the Conservatives edged the vote by 2,000 votes.
Labour have held onto the crucial seat of Stoke-on-Trent, brushing aside UKIP leader Paul Nuttall in the process.
A highly toxic chemical was used in the death of North Korean leader Kim Jong-un's half brother last week, tests have shown.