Girls, can you please tell me, is it normal for my little one to start…

Girls, can you please tell me, is it normal for my little one to start poking at her belly button on November 12th and only in the lower abdomen? She has never done so higher up. Sometimes she pulls down there, is that normal? Or should it not be like this? Should I go see a doctor? It's not bothering me much, but these pinches bother me.