Parents have been warned to stop using certain car seats "immediately" amid safety fears.
Argos issued an urgent recall of five products that are manufactured by Mamas & Papas exclusively for the retailer.
It is feared the models may not be able to protect children in the event of a crash, with their shells "cracking under impact".
In a statement, Argos said: "We have identified a potential safety concern. In the event of an accident the car seat shell may crack and therefore not provide the intended level of protection to the user.
"If you have purchased any of the seats, you should immediately stop using the product and return the car seat to your local Argos store for a full refund.
"We wish to thank you for your co-operation and apologise for any inconvenience caused by this recall."
The affected models:
Mamas & Papas Mercury Group 1 Black (Argos catalogue number 297/7526).
Mamas & Papas Mercury Group 1 Grey (Argos catalogue number 411/9100).
Mamas & Papas Mercury Group 1-2-3 Black (Argos catalogue number 305/6037).
Mamas & Papas Mercury Group 1, 2, 3 Grey (Argos catalogue number 397/9530).
Mamas & Papas Mercury Group 2-3 Black and Grey (Argos catalogue number 245/4829).
A Mamas & Papas spokesperson told The Huffington Post UK: "Mamas & Papas has been in discussion with Argos about their decision to suspend sales and recall certain car seats, which are manufactured by Mamas & Papas exclusively for Argos.
"We continue to work closely with Argos to determine the exact nature of the issue.
"We wish to reassure our customers that we take product quality and assurance very seriously and that the safety of our customers is always our primary concern.
"All our products are audited and checked - by routine batch sample testing of production - at accredited test laboratories.
"We would like to apologise to customers for any inconvenience the recall has caused.
"We would also like to assure them that there have been no reports of any incidents involving any of the recalled car seats."
The warning, posted on Playpennies Facebook page, has been shared nearly 10,000 times.