Travis and Nick Peterson in Southern California devised the card to remind parent what they've signed up for
The incessant wailing is activated at the press of an unassuming button - but lasts more than 180 minutes
If you continue to press the button, the agonising cries only get louder - and can't be stopped even if the card is ripped or crushed
However, a tongue-in-cheek message inside the card reads 'the gift that keeps on giving' - and, indeed, the screaming baby doesn't stop even if the card is ripped or crushed.
When the recipient pushes a button which just says 'press' next to a musical note, likely to be expecting a brief jingle, the relentless wailing begins - and the agonising noise only gets louder when you press it again
On the creator's website Joker Greeting, the description for the product reads: 'Yes, a baby shower card that is a baby crying incessantly.
'Welcome them into parenthood the best way possible.'
The sender of the £7.54 card, which is available for pre-order for March, can test out the noise on 'safe mode' without actually activating the non-stop crying.
Before sealing the envelope, they just need to remove a pull-off tab to make the card ready for the unlucky recipient.
President of Joker Greeting, Travis Peterson, who lives in Orange County, was inspired to create this card by his experiences with his own child as a baby.
President of Joker Greeting, Travis Peterson, was inspired to create this card by his experiences with his own child as a baby - and thought it was a great way to say 'welcome to parenthood'
The card costs £7.54 and is available to reorder from the Joker Greeting website for March
Mr Peterson said: 'I have a three year-old and a baby due in February. I am familiar with this sort of noise.
'This was one of our first ideas once the birthday card was successful. We figured it was a great way to say: "welcome to parenthood".
'We haven't yet shipped any of these cards, but I know this Baby Shower card will be a hit.
'It strikes a very particular and personal nerve - and yet it is still funny.'
He added: 'The Joker Baby Shower card is a follow-up to our amazing Joker Birthday card which continues to be successful.
'I love hearing stories and feedback about how people suffered for six hours listening to the cards or how they decided to finally destroy the card. It's great.'