Look for age appropriate carrier as not all carriers are suitable for newborn. Those carriers that suitable for newborn will have an insect to support baby’s posture. We hAve been using Manduca since LO was a newborn, able to use it until LO is 20kg. Now LO coming to 3 at 14kg, still using especially l during traveling.
I use a hip seat carrier. It has good support for baby’s bottom, and when I face baby toward’s me, baby doesn’t need to be able to sit up straight or have the best neck support, because baby’s resting against my chest:) For my first daughter, we even used the carrier till she was 2yo.
I'm using konny no issue on baby wearing got a Tula when 6 months old. Using both till now 16 months
https://sg.theasianparent.com/all-about-baby-slings-understanding-everything-about-baby-carriers
Jo