The US advertising account was previously held by D'Arcy Masius Benton & Bowles, New York, part of the B|Com3 Group, which is being acquired by Saatchi's owner Publicis in a $3bn deal.
Saatchis already handles the account in the UK and most of the world. One of the ads shown in the UK last year, for Pampers Total Care, received 135 complaints as it said that the nappies were designed "to handle pee but also soft poo".
Its latest series of ads for the nappy brand shows life from a baby's point of view.
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