I just reread your post did you mean belly or belly button?
Lol you can tell it my first I thought my belly got hard
It is different for everyone. Mine is hard when I stand up but not when I sit down. And its been like that since like 15 weeks I'm now 22+1.
ill be 8 months friday and my belly still aint hard. i get hard at times when baby ball up or braxton hicks.. but, its normally not hard. i can still push on my baby and stuff. why should your belly be hard?