Peace be upon you. According to Grand Ayatollah Sayyid Sistani (may Allah protect him), it is sufficient to purify the impurity caused by the urine of a baby (as long as the baby is still nursing and has not started eating solid food) by pouring water over it once, enough to cover the area. There is no need to wring it out or take similar actions if the impurity is on clothing or similar items. According to Grand Ayatollah Sayyid Khamenei (may Allah protect him), there is no difference in the impurity of urine whether it is from an infant or otherwise. However, it is not necessary to wring out or take similar actions when the impurity is from an infant's urine, even if it is on clothing or bedding. It suffices to pour water over it once, ensuring that all parts are covered, although it is preferable to do it twice. It is important that the infant is not accustomed to solid food, and it is preferable that the infant is male rather than female. For other cases or for non-infants, after removing the visible impurity, it is necessary to wash the affected item with a small amount of water twice, preferably not counting the first wash that removes the impurity, and to extract the wash water by wringing or similar actions. The wash water is considered impure and should be avoided. For washing with a large amount of water, one wash is sufficient after removing the visible impurity, with wringing or similar actions being preferable. May you be successful in all good deeds.