Hey there

I had a small bub and definitely needed the insert. We used it until she was about 10 weeks and had better neck support. It does get a bit hot so I dressed both if us in one less layer.

Personally I wouldn't pop a newborn in without it, but others may have different experiences. I guess another option would be to swaddle froggy-legged in a light wrap first, though I haven't tried that myself.

I'd be happy to send you mine, it's just the one bub for us PM if you're interested.