Comfort Pure and Persil Non-Bio Powder, which Unilever is touting as its mother and baby brands, will appear on shelves with a picture of a newborn baby sporting a gold crown.
The packs go on sale the day after the birth of William and Kate’s heir is confirmed.
The royal celebratory packs will feature gold foil decoration and writing, as well as a gold effect bottle cap.
The limited edition packs feed into Unilever’s overall £3.5m mother and baby campaign for Comfort Pure, supported by digital activity on the brand’s Facebook page. Unilever is also providing consumers with a 'Guide to raising your baby like a Royal’, available to read online.
Fernanda Tubini-Roberts, Comfort marketing manager, Unilever UK, said: "As specialists in creating laundry products suitable for babies, both Comfort Pure and Persil NonBio Powder are perfectly positioned to spearhead the royal celebrations for the category.
"They are both iconic British brands with a loyal following, and we anticipate that the birth of the royal heir will encourage both existing and new shoppers to engage in the celebrations and purchase the keepsake packs."