I found DS loved being wrapped for the first 5 or 6 months so didn't try gro bags before then. Being wrapped up nice and tight seemed to help him settle. They have been great ever since though. The actual gro bag brand can be pricey, there are heaps of different ones out there though. At almost 16 months old DS is very comfy in his bags, he can roll around and stand up without any issue. I have different weights for different seasons so he doesn't get too hot or cold. I don't have to use blankets during winter, DS is warm enough with a heavier bag.

As for after birth, I kept using my pregnancy belly bands. They were great for keeping everything nice and comfortable!