Tyler stood up all by himself last night!  He had just gotten done eating, and I took him out of the highchair and set him on the floor in the kitchen by his toy cellphone.  He was on his hands and feet, with his butt in the air.  He grabbed the cell phone in one hand and just stood straight up!  I started to reach for him by reflex, and then did a double take when I realized he was standing up on his own.  He stood there for a good 15 seconds or so, before getting wobbly.  But even after I offered him my hand, he only lightly touc