Sitting, crawling, and standing are an adventure he will try. He has learned to open and close his fingers to throw or drop objects. When tired or cranky baby is becoming more anxious around strangers. Exploring is your child's favorite activity now. Shaking, Banging and dropping are some ways the do their exploration.
Sight is almost as good as an adults now.
She can probably crawl upstairs and take a few steps with support. By now your baby is understanding many words. You may think its magic but its just the magic of growing up. She will respond to her name by looking around the room she is in. All the things she has learned throughout her first nine months of life will be extremely important for her first three years of life.