I'm kinda worried

Jonella • Mom of One, Mom of 2 Fur Babies, Engaged💍, Arizona 🌞, 21

so my sweet little girl is gonna be 6 months on the 13th, and she doesnt sit up unsupported, she doesnt stand up by herself while holding onto a surface (only when I hold her hands, she's not crawling.. what do I do and should I be worried?