Which stage in Winder's development includes 90/90 sitting and the short transfer (STS)?

• A. Stage 1
• B. Stage 2
• C. Stage 3
• D. Stage 4

Answer: (C)

In this developmental framework, Stage 3 reflects a level of postural control where the child can get into and hold a more refined seated position and begin functional transitions. Achieving 90/90 sitting means the hips and knees are flexed to about 90 degrees with a stable pelvis and trunk, which requires coordinated trunk control, pelvic stability, and the ability to manage weight shift without tipping. From that stable seated base, performing a short transfer to standing (STS) shows the child can initiate and complete a brief sit-to-stand movement, coordinating hip and knee extension with balance and weight transfer. These abilities indicate moving beyond supported sitting toward independent or more functional standing and transitions, which is characteristic of Stage 3. Earlier stages typically lack this level of trunk control and the ability to perform such transfers, while later stages involve more advanced, fuller standing and ambulatory skills.