Generally at two months, the baby’s brain will begin to develop gradually, will smile at the person they are talking to, and some will also look at the person they are talking to, which means that the baby’s brain has some perception of the scene. At three months, they will recognize people and should know their mother. The baby has some knowledge of the people around him, especially the mother is more familiar with. Usually the mother and the baby spend more time together, so the baby is more familiar with the mother. The baby can identify the mother through her smell, heartbeat and voice. At this time, the baby is more sensitive and only lets the mother hold it, and the baby will cry as soon as others hold it. This should be a normal reaction of the child and has a certain relationship with the child’s development. During this period the mother as much as possible to soothe the child, more conducive to the child thriving and healthy growth.