9 to 14 months
At about 9 months, your baby will likely try to pull himself up to a standing position. Once he's up, he might find that if he leans against the couch or wall, he can stay standing. But what goes up must come down -- and your pre-walker may not know how to lower himself. If he starts crying, help him bend his knees so he can get back down to the floor without falling.
Once your baby gets comfortable standing, he'll likely try to get around by cruising: traveling up and down the length of the couch or along the wall by holding on. He'll also enjoy "walking," clutching your hands as you keep him upright.