Took 2 hours to get baby ready for a 15-minute outing

2 HOURS. For a walk around the block. Why does getting a 3-month-old out of the house require: outfit change (spit up), diaper change (surprise poop), feeding, packing the diaper bag, making sure the car seat is installed right, getting him settled, then finding our keys. By the time we're ready to go I'm exhausted and the baby's mood has completely changed. Do people just... never leave the house or am I doing something wrong?