Leah Reilly posted on Facebook after discovering a warning on the Lenor Spring Awakenings fabric softner.
She said: "Never seen this before but all mums need to know DO NOT PUT THIS ON YOUR KIDS SLEEPWEAR!!! Look there's a warning on the back of the bottle!"
She said the back of the bottle does state "Do not use this product: On children's sleepwear or garments labelled as flame resistant as it may reduce flame resistance."
Offering a more detailed explanation, someone on Facebook added the comment: "It rids the flame retardant off items after so long, so in a house fire you will have half or even less than half the time to get out of the house before everything that everyone sprays Lenor on is ablaze.
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"It's scary I don't know why people are even joking about this."