Hey, Elaine,
Yeah, you should be able to carry a baby in the Cybex Cocoon S - if we're talking about the one with the carry straps (of course, just short distance). However, with a heavier baby, if could become a bit too much - as far as I know, the carrycot in general are tested up to 9 kg, so after your little one goes over that, be extra careful about the stability of it. Also good to know that if you do have a Gazelle carrycot and he still fits in it, you should be ok with using it even with a 9-10kg baby. It's definitely sturdier that ne coccoon and will not fall apart right after the baby gets to those 9 kg. So I would personally use the carrycot until the child fits in it.