Congrats!

I don't want to worry you but the belly on the small one looks odd to me. I new at this too but it might be worth looking into hard belly I believe it's called. If her belly is as hard as it looks, you may need to do something about it to save her. I would at least look into it so you know what to look for and what to do if she does have it. I had a friend lose one of his babies from it because he never heard of it so he didn't take action quick enough. Just look into it, better safe than sorry.