The purpose of this study is to investigate the communication differences between twins and singletons when communicating with their caregiver. Participants will be in the age range of two to four and a half years old with typical development. Both types of communication, nonverbal and verbal will be observed and video recorded. Participants will be administered the Clinical Evaluation of Language Fundamentals Preschool 2 (CELF-P2) to establish a baseline and to rule out any suspected language delays. In addition, the parents will complete a questionnaire that is geared specifically to their child's early language development. After obtaining the language samples, the Principal Investigator will transcribe and record the different communication markers of each child participant. The goal of this study is to establish, understand and compare the similarities and differences that arise in the interactions between the groups of children, twins and singletons, when interacting with their caregiver.