When will my baby sit?

From this article, it says that babies tend to sit up unassisted from about 7 months of age. Before being able to sit up, he should first master the techniques of rolling and flipping over without assistance. Give your baby lots of tummy time for him to build up arm, neck and back strength which will aid him in sitting up when the time comes. http://sg.theasianparent.com/baby-at-12-months-milestone-checklist-for-proper-baby-development/