My lo is 5mo+ and starting to try to sit..but she always lean forward using her hand to support. Is it ok for her to be in this position? But usually not for extended period of time..as she may topple.

Hi there, according to this article on baby's milestones (link below), it is actually very normal :) At that age, baby will learn how to prop herself up on her arms and hold her chest off the ground, like a mini-pushup. Not too long after, she will be able to sit momentarily without assistance. Don't worry about baby being in the position for too long. When she's tired, she'll know when to stop and you should stand by to provide support and surround baby with pillows to cushion a possible fall. http://www.babycenter.com/0_baby-milestones-sitting_6505.bc

It's normal. My LO 5.5 months also same.sit by her own without support but slowly she will lean forward too. Then back to her tummy again 😂

Yes, this is called the tripod position, completely normal for this age:)

Its called tripod n its ok. Normal to learn that way