Answer:
This phase is called the "reciprocal relationship phase".
Step-by-step explanation:
John Bowlby, in his Attachment theory stated that infants get attached to their caregivers (usually mothers) early on and form emotional ties with them.
He described four phases of attachment, one of which is the "Formation of Reciprocal Relationship".
In this phase, toddlers at 18 months to two years of age start to understand their mothers more and can now predict certain behaviors such as her going and coming. This helps the toddler develop a sense of security and protest less when the mother leaves, knowing she will return soon.