When can babies use nuna trvl?

Hello there, I'm curious about the usage of nuna trvl for babies. Could you please clarify when exactly it's SAFE and appropriate for babies to start using nuna trvl? Are there any specific age or developmental milestones that parents should be aware of before introducing nuna trvl to their little ones? Additionally, are there any safety considerations or precautions that should be taken into account when using nuna trvl with babies? I'd appreciate any insights or recommendations you might have on this matter. Thank you!