Britney Spears' ex-husband Kevin Federline is reportedly shocked the singer didn't fight harder for custody of their two young sons.

Federline was awarded sole custody of Sean Preston, two, and Jayden James, one, earlier this month, following a bitter 18-month court battle. It means he now has to juggle being a full-time parent to his sons and looking after his two children from a previous marriage. And he is said to be adamant that Spears' should take an active role in bringing up the boys.

A source tells British magazine Closer, "Kevin loves his sons, but he didn't aim for sole custody. He wanted to be a co-parent and didn't expect Britney not to fight for custody. He never wanted full responsibility. He believes both parents should take an active role. It's tough being a single parent, plus he already has another two children."

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(This news article provided by World Entertainment News Network)