BERLIN — A woman killed her five infants shortly after giving birth in secret at home and in the woods because each time she got pregnant she worried her husband would leave her if she had any more children, authorities said Thursday.

The woman, 28, who has been arrested on five counts of manslaughter, made a "comprehensive confession" to the killings after turning herself in as a six-year investigation closed in on her, said Ulrike Stahlmann-Liebelt, the head prosecutor in Flensburg, on Germany's border with Denmark.

Stahlmann-Liebelt said the woman, whose name was not released in accordance with German privacy laws, has two living children, aged 8 and 10. But then in 2006 she began hiding her pregnancies, staying away from doctors and hospitals and killing the infants after giving birth to two at home and three in the woods, she said.