In this case, you should have been called by Mead Johnson Medical Parenting Center. They either cooperate with the hospital where you gave birth, or do child care, or you buy or accept Mead Johnson's milk powder. So they have information about you. They don't mean any harm, just hope that you can buy their products for a long time, and they will also teach you some parenting knowledge. If you don't want to answer the phone, just tell him you dialed the wrong number and changed the number. If there is no baby at home, they should stop calling.