A:Answer No, it only comes with 1 sensor. What makes this an extension pack is that it includes a newborn sock and a baby/toddler sock that grows with the child. But there is only 1 sensor that has to be moved from the newborn to the toddler sock. For twins, you'd have to buy 2. You could always get the newborn one since its cheaper and then purchase the toddler sock when your babies get bigger.
