You simply pull it out of the bag, and then stretch the legs outwards, and they quietly click into place. Unroll the mattress, pop it in the bottom (it sticks with velcro securely to the base so there’s no movement), and that’s it.
Article source: https://www.huffingtonpost.co.uk/entry/nipper-nest-travel-cot-playpen-review_uk_69b1814be4b0ab06e5f3ae58