Its for their zippered sleep and plays

http://www.cpsc.gov/en/Recalls/2013/Carters-Recalls-Infant-Clothing-with-Zippers/?utm_source=feedly#Remedy

Carter’s, Inc.; toll-free at (888) 282-4674 from 8 a.m. to 4:30 p.m. CT Monday through Friday, or online at http://www.Carters.com and click on Product Recalls.