Also, note that the baby gets to grow with such a carrier as you can quickly adjust the straps for a perfect fit. (strollerlab.net)
Be certain that you look at what you are getting out of such carriers when finding something you can use for your twins without making them feel uncomfortable. (babycarrierhq.com)
A harness in such a carrier does not make it safe, these carriers are unsafe and unfortunately potential death traps. (babywearingschool.com)