Nickle my friend had similar circumstance to your son and her son was circumcised at 12 months due to medical necessity, it was under a general and also required stitches.

The procedure used on babies under 4 weeks of age isn't that same as an older child, as they are not moving around, sitting, crawling etc. My sons had no on going pain at all I couldn bathe them as normal and after about 7 days the plasti bell just came off (generally I found it in there nappy). As soon as the precedure was finished I breastfed my boys, they then went into a good sleep. I didn't notice any changes to their sleeping or feeding patterns as a result of the circumcision.

I just wanted to clarify that they are very different procedures compared to a newborn and a toddler.