Mum's: Baby sling instead of pushchair when out and about for newborn's and baby?

I have a Slingling sling that is similar. One thing that comes to mind, do this come in MANY sizes? Since the 'pouch style' sling isn't adjustable, fit is everything. And to the poster that says she is too small. Slingling wither has her size or will make on to fit. I did the 'cradle carry for the 1st 6 months (my guy was tiny), then a hip carry after that. He is now 16 months ols, and still loves his 'pouch'. Now, I ahve a ring-sling if we are going in and out, easier to adjust.