I love close carrier for newborn, I still use now for DS2 at 9 months old and 9kg.

Ergo I love from 4 months, I hated using newborn insert so I think I only used it 2 or 3 times. I still use ergo heaps DS1 regularly goes in it on my back at age of 2 and 1/4 and 13 kgs.

Not sure if that helped or not.