Talk to Pediatrician on Child Development

Hi my baby was able to sit well for vrry long time without support by the time she was eight months old, rolled ocer by nine months.. She us oe year old nw and can sit on her own from a layimg down position but needs slight help like i have to hold her legs slightly so that she can come into a sitting position. She cant pull up to stand or walk right now. I make her stand with support for a while and she is able to stand for eight to ten mins but afterwards she cries alot.. What can i do to help her achieve milestones on time.