Hey,
Lo was around 9 months when we had ours. They weigh and measure them. And get them to play with toys (can they follow a moving object with their eyes), roll around, crawl if they can. And they ask different questions concerning development, ie can they speak, use a beaker, sit up unaided, pass objects from hand to hand. Its basically an in depth development review. Ours lasted about 45 mins xxxx