When a baby is upset because a caregiver is leaving the baby is exhibiting?

When a baby is upset because a caregiver is leaving, the baby is exhibiting signs of separation anxiety. This behavior typically arises around 6 to 9 months of age as infants develop attachment to their primary caregivers. The distress reflects their emotional bond and dependency on the caregiver for comfort and security. It's a normal part of emotional development, indicating the baby's growing awareness of their social environment.