Generally when the baby is 3 months old to change the larger size of the pacifier, but it also depends on the specific situation of the child and the pacifier. As the baby’s age increases, the baby’s sucking ability and mouth shape will change, if you do not give the baby for a long time to change the larger pacifier, then it may lead to problems related to the pacifier is too small, affecting the normal growth and development of the child, generally speaking about 3 months to change the pacifier is possible. But specific also according to the child’s growth and development and the quality of the pacifier and so on, if the child grows faster, or the pacifier early cracks, etc., then the replacement of the pacifier may not need to be replaced in 3 months, and vice versa, may not need to be replaced in 3 months. Baby pacifiers can not always use the same model, parents should be replaced in a timely manner more suitable for the baby’s pacifier, to ensure the normal growth and development of the baby.