Recent research indicates that earlier than piaget expected infants actively search for hidden objects the first signs of problem solving by analogy emerge infants master the a–b object search toddlers engage in make-believe play

The answer that will complete the statement is,

"Recent research indicates that the first signs of problem solving by analogy emerge earlier than Piaget expected."

Piaget's cognitive development theory has four stages. The first stage is the sensorimotor, wherein he thought that mental representations are constructed by babies through sensorimotor activities. However, recent researchers now believe that babies have innate core domain of thoughts according to the core knowledge perspective. These domain of thoughts enables babies to grasp information and make sense of their experience that help them develop rapidly.