It's been about four months since Amazon announced its plans to acquire of Quidsi, the parent company of Diapers.com and Soap.com , for $540 million . The deal has not yet closed, primarily due to an extended review by the FTC. The FTC took nearly seven months to approve the Google AdMob deal, so it is not yet as bad as it could be. But it is also unclear what antitrust concerns the FTC might have with this particular deal. Is the FTC worried that a combined Amazon-Quidsi will corner the online diapers market and provide free overnight shipping to parents all across the country?