If your baby has started to recognize common faces, then it is an absolute surety that his observational skills have enhanced at this point. This ability majorly develops with age and becomes more evident when your little one crosses seven months but the roots of it has already formed from this stage. If you will introduce a strange face to your baby, he will either shy out or start crying.
What you need to know
As a parent, you need to make sure that your little baby recognizes everyone in the family. It is good he can differentiate between known and unknown faces, but a sense of familiarity needs to be taught to your charming prince from an early age. Do not push or make it difficult for the baby by introducing everyone at once. His skills need some duration to be leveled up; allow your baby his own time to develop an understanding about various people who are living around. Plan out frequent family outings and dinners that would surely help your infant memorize the faces of the family members.