A child has recently developed mouthing but has not developed stranger anxiety, likes and dislikes for food. What is the most appropriate age of this child?

Since the child in question has developed mouthing (develops between 3-6 months) but has not yet developed stranger anxiety or likes and dislikes for food which are developed at 7-8 months and in first year of life respectively, the appropriate age of this baby should be 5 months. Ref: Early Years: Child Care and Education, By Maureen O'Hagan, Maureen Smith - Pg 16; Nelson 17th Edition, Page 34, 82; Essential Pediatrics, OP Ghai - 6th Edition, Page 44, 47