I've searched around in this and it seems a bit unusual. Baby is 10 months, in good health, aside from recent vomiting bug. I noticed at bedtime it looks like he has a small umbilical hernia. I touched it to assess and felt a slight sensation as it went back in. He wasn't distressed by this but moments later it protruded again.
Has anyone had this? Internet search shows normally they are present at birth and go by age 1 themselves but obviously this is slightly different.