Most baby shoes are designed for the parents looking at them, not the baby wearing them. Aretto is the opposite of that, soft, flexible, almost nothing there, because a newborn foot needs room and movement, not a rigid little shoe holding it in place.
No, sleep time is bare feet time, the foot moves around a lot during rest and it needs that, so just take them off before the nap and put them back on when you head out.
Trace the foot on paper, heel to the longest toe, measure that line, then pick a size slightly above it because these feet will be a different size again before you know it and a snug fit today is a tight fit next month.
Outside. Indoors let them go barefoot if you can, that’s genuinely better for how their feet develop at this stage. The shoes come into their own on pavements, in prams, anywhere the surface is cold or rough or just unknown.
The early months before walking are happening. These are built for when feet are at their softest and most sensitive, which is also when the wrong shoe does the most damage, so the flexibility and fit actually really matter here.
Great gift, honestly, new parents get a lot of things they don’t need and these are something they actually use. Packaging depends on the style so check the product page, but the shoes themselves tend to land well.