This means you don't need any infant insert in the baby carrier for your newborn's earliest days. (babybjorn.ca)
Are they suited for a convertible car - seat or do they really need that infant seat? (pregnancymagazine.com)
Your kid can use them starting from the time when he's a baby until he doesn't need an infant car seat any more, adjusting it accordingly along the way. (smartbabyhq.com)