Baby lotion or baby oil! I had the same problem, I'm 6 weeks. It helped me. Maybe it'll help you :)
My sister used regular baby lotion.. she said it worked for her! Hope this helps!!(:
Mine itch too lol :/ idk what to do tho
I have been having the same problem with itchy nipples, they absolutely drive me crazy sometime, but I have no idea how to stop it...maybe some kind of nipple cream from the store? Idk. But I'd like to know too. And as for your tummy, that is perfectly normal at only 7 weeks, I'm 10 weeks & mine still hasn't hardened any. It won't do that until your baby gets bigger, so a few more weeks. :)