15,000 new and expectant parents have had their details stolen in a data breach.
The National Childbirth Trust (NCT) informed its users their email addresses, usernames and passwords had been compromised but stressed that no further information had been accessed.
A spokesman confirmed 15,905 users were affected.
He added: "NCT has suffered a data breach which, regrettably, has caused some users of our website to have their registration details compromised.
"These details are limited to their email address, username and an encrypted version of the password that they created to register on the site.
"We stress that no financial or personal details are held as part of this data so no financial or personal details have been accessed. We discovered the breach (on Wednesday), upon which we contacted everyone affected advising them of the breach and suggesting that they change their username and passwords."
Chief executive at NCT, Nick Wilkie, said: "While your password is encrypted, as a precaution, I would advise you to change any password as soon as possible for other accounts or registrations that use these details."
We discovered the breach today, are reporting the matter to the police and Information Commissioner and contacting all who are affected immediately."
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