As you pass your wee one sleeping peacefully in the crib, you may smile or bend over to drop a last goodnight kiss.

But before you tuck her in next time, check the mattress. IKEA has expanded a recent recall of crib mattresses because they are too short for a normal-sized crib, which means that the baby’s head could get caught in the space between the mattress and the end of the crib.

IKEA began the recall after receiving two reports of just such incidents. Thankfully, both babies were both rescued uninjured.

Related: The Sleep-Safe Baby Guide

Known as an entrapment hazard, this extra space could injure and even suffocate a baby. You can check your mattress by removing the crib sheets. If the space between the mattress and crib has a gap larger than the width of two fingers, the mattress is defective.

If you find that type of gap, remove the mattress. “Customers should immediately stop using the recalled mattress and return it to any IKEA store for an exchange or full refund,” IKEA stated in its press release.

Related: 5 Dangerous Baby Products to Avoid

The recall involves Ikea SULTAN and VYSSA crib mattresses with the following model names:

  • SULTAN DROMMA
  • SULTAN BLUNDA
  • SULTAN SNARKA
  • SULTAN SUSSA
  • VYSSA VACKERT
  • VYSSA VINKA
  • VYSSA SPELEVINK
  • VYSSA SLOA
  • VYSSA SLUMMER

According to IKEA, the mattresses that were recalled are 52 inches long and 27 and a half inches wide; they were manufactured on May 4, 2014 or earlier in Mexico, Poland, China and the United States. You can find the date of manufacture on the identification label attached to the mattress cover — it should display that date in Month-DD-YY format or YY-WW format, along with the SULTAN or VYSSA model name. In the YY-WW format, IKEA is recalling mattresses with a date code of 14-18.

Related: How to Know If Used Baby Gear Is Safe

Nearly 170,000 VYSSA crib mattresses were recalled in the United States in January 2015. IKEA has now recalled about 131,000 SULTAN crib mattresses in the U.S. and another 44,000 in Canada.

If you have one of these mattresses, stop using it and return it to Ikea for a full refund. For more information, call IKEA at 888-966-4532 or visit www.ikea-usa.com and click on Product Recall near the bottom of the page. You don’t need a proof of purchase to get a full refund.

Diana is an award-winning writer and editor with more than 20 years' experience in magazine, video, book and digital journalism, with a specialty in health coverage. She was a longtime writer and news editor at the Center for Investigative Reporting; has written for publications from the Washington Post to the Times of London syndicate; and has served as a senior and/or consulting editor at Time Inc. Health, Hippocrates, HealthDay News Service and Reporting on Health. She was also editor in chief of Consumer Health Interactive, a national health and medical web site, and has reported on finance for Blueshift Research and PBS Frontline. Before joining SafeBee, she was editor of Bioenergy Connection, a national magazine about bioenergy at UC Berkeley. Her favorite safety tip: Wear a bike helmet.