Around 2-3 months of age, the baby would be able to hold her head steady while sitting and also pulls to sit without head lag. This allows more visual interaction and indicates good muscle tone in the neck.
By 3-4 months, the baby rolls over onto her stomach and learns to lift her head.
By 6-7 months of age, the baby will be able to sit without support, and also creep on a plain surface, first backwards, then forwards. Soon after, she will try and crawl forward with the stomach off the ground.
Around a year of age, she would be able to walk unsupported.
By 15-16 months, she can run unsupported and requires more supervision.