From 12 months of age baby’s memory improves due to the development of the cerebral cortex, and they may seek out a favourite toy specifically rather than simply recognizing it when it is in front of them. For example, baby may ask “where’s teddy?”. The improvement in memory may also see an increase in separation anxiety when left with caregivers that are not the parents. While it can be distressing to see your little one upset, it is a normal part of development.