My sweet boy is 6 months old today. He has grown up so fast went from being 5 pounds to where he's…

My sweet boy is 6 months old today. He has grown up so fast went from being 5 pounds to where he's at now. Can't feel like he's behind in some areas he hates solids still after trying for so long. He can sit up a bit with support and he laughs all the time. I know they go at their own pace but I can't help but worry.