Make sure your baby is safely secured in the stroller with both a seat belt and a strap between his legs. The stroller should have a brake to lock the wheels so it won't roll off unattended. Look for a stroller with a wide base and a basket that hangs at a low level to prevent tipping. The same precautions apply whenever your baby is seated in a grocery cart. Use either the attached safety belt or a baby carrier designed specifically for shopping carts.
Baby can stand alone, possibly for a few minutes.
She drinks from a cup. She expresses herself with gestures and sounds instead of cries. Baby can roll a ball to you. She uses gibberish in a conversational way. All babies have their own internal developmental timetable.